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Deserts are found 【1】 there is lite rainfall or where rain for a whole year falls in only a few weeks' time. Ten inches of rain may be enough for many plants to 【2】 if the rain is spread throughout the year.If it falls within one or two months and the rest of the year is dry, those plants may die and a desert may form. Sand begins as tiny pieces of rock that get smaller and smaller as wind and weather wear them down. Sand dunes are formed as winds move the sand across the desert.Bit by bit, the dunes grow over the years,always 【3】 with the winds and changing the shape.Most of them are only a few feet tall,but they can grow to be several hundred feet 【4】 . There is, however,much more to a desert than sand.In the deserts of the southwestern United States, cliffs and deep valleys were formed from thick mud that once lay 【5】 a sea more than millions of years ago.Over the centuries, the water dried up. Wind, sand, rain, heat and cold all wore away at the 【6】 rocks. The faces of the desert mountains are always changing ——very, very slowly;—— :as these forces of nature continue to work on the rock. Most deserts have a 【7】 variety of life. There are plants, animals and 【8】 that have adapted to life in the desert.During the heat of the day, a visitor may see very 【9】 signs of living things, but as the air begins to cool in the evening, the desert comes to life. As the sun begins to rise again in the sky, the desert once again becomes quiet and 【10】 .
Deserts are found 【1】 there is lite rainfall or where rain for a whole year falls in only a few weeks' time. Ten inches of rain may be enough for many plants to 【2】 if the rain is spread throughout the year.If it falls within one or two months and the rest of the year is dry, those plants may die and a desert may form. Sand begins as tiny pieces of rock that get smaller and smaller as wind and weather wear them down. Sand dunes are formed as winds move the sand across the desert.Bit by bit, the dunes grow over the years,always 【3】 with the winds and changing the shape.Most of them are only a few feet tall,but they can grow to be several hundred feet 【4】 . There is, however,much more to a desert than sand.In the deserts of the southwestern United States, cliffs and deep valleys were formed from thick mud that once lay 【5】 a sea more than millions of years ago.Over the centuries, the water dried up. Wind, sand, rain, heat and cold all wore away at the 【6】 rocks. The faces of the desert mountains are always changing ——very, very slowly;—— :as these forces of nature continue to work on the rock. Most deserts have a 【7】 variety of life. There are plants, animals and 【8】 that have adapted to life in the desert.During the heat of the day, a visitor may see very 【9】 signs of living things, but as the air begins to cool in the evening, the desert comes to life. As the sun begins to rise again in the sky, the desert once again becomes quiet and 【10】 .
Deserts are found 【1】 there is lite rainfall or where rain for a whole year falls in only a few weeks' time. Ten inches of rain may be enough for many plants to 【2】 if the rain is spread throughout the year.If it falls within one or two months and the rest of the year is dry, those plants may die and a desert may form. Sand begins as tiny pieces of rock that get smaller and smaller as wind and weather wear them down. Sand dunes are formed as winds move the sand across the desert.Bit by bit, the dunes grow over the years,always 【3】 with the winds and changing the shape.Most of them are only a few feet tall,but they can grow to be several hundred feet 【4】 . There is, however,much more to a desert than sand.In the deserts of the southwestern United States, cliffs and deep valleys were formed from thick mud that once lay 【5】 a sea more than millions of years ago.Over the centuries, the water dried up. Wind, sand, rain, heat and cold all wore away at the 【6】 rocks. The faces of the desert mountains are always changing ——very, very slowly;—— :as these forces of nature continue to work on the rock. Most deserts have a 【7】 variety of life. There are plants, animals and 【8】 that have adapted to life in the desert.During the heat of the day, a visitor may see very 【9】 signs of living things, but as the air begins to cool in the evening, the desert comes to life. As the sun begins to rise again in the sky, the desert once again becomes quiet and 【10】 .
Deserts are found 【1】 there is lite rainfall or where rain for a whole year falls in only a few weeks' time. Ten inches of rain may be enough for many plants to 【2】 if the rain is spread throughout the year.If it falls within one or two months and the rest of the year is dry, those plants may die and a desert may form. Sand begins as tiny pieces of rock that get smaller and smaller as wind and weather wear them down. Sand dunes are formed as winds move the sand across the desert.Bit by bit, the dunes grow over the years,always 【3】 with the winds and changing the shape.Most of them are only a few feet tall,but they can grow to be several hundred feet 【4】 . There is, however,much more to a desert than sand.In the deserts of the southwestern United States, cliffs and deep valleys were formed from thick mud that once lay 【5】 a sea more than millions of years ago.Over the centuries, the water dried up. Wind, sand, rain, heat and cold all wore away at the 【6】 rocks. The faces of the desert mountains are always changing ——very, very slowly;—— :as these forces of nature continue to work on the rock. Most deserts have a 【7】 variety of life. There are plants, animals and 【8】 that have adapted to life in the desert.During the heat of the day, a visitor may see very 【9】 signs of living things, but as the air begins to cool in the evening, the desert comes to life. As the sun begins to rise again in the sky, the desert once again becomes quiet and 【10】 .
Deserts are found 【1】 there is lite rainfall or where rain for a whole year falls in only a few weeks' time. Ten inches of rain may be enough for many plants to 【2】 if the rain is spread throughout the year.If it falls within one or two months and the rest of the year is dry, those plants may die and a desert may form. Sand begins as tiny pieces of rock that get smaller and smaller as wind and weather wear them down. Sand dunes are formed as winds move the sand across the desert.Bit by bit, the dunes grow over the years,always 【3】 with the winds and changing the shape.Most of them are only a few feet tall,but they can grow to be several hundred feet 【4】 . There is, however,much more to a desert than sand.In the deserts of the southwestern United States, cliffs and deep valleys were formed from thick mud that once lay 【5】 a sea more than millions of years ago.Over the centuries, the water dried up. Wind, sand, rain, heat and cold all wore away at the 【6】 rocks. The faces of the desert mountains are always changing ——very, very slowly;—— :as these forces of nature continue to work on the rock. Most deserts have a 【7】 variety of life. There are plants, animals and 【8】 that have adapted to life in the desert.During the heat of the day, a visitor may see very 【9】 signs of living things, but as the air begins to cool in the evening, the desert comes to life. As the sun begins to rise again in the sky, the desert once again becomes quiet and 【10】 .
Deserts are found 【1】 there is lite rainfall or where rain for a whole year falls in only a few weeks' time. Ten inches of rain may be enough for many plants to 【2】 if the rain is spread throughout the year.If it falls within one or two months and the rest of the year is dry, those plants may die and a desert may form. Sand begins as tiny pieces of rock that get smaller and smaller as wind and weather wear them down. Sand dunes are formed as winds move the sand across the desert.Bit by bit, the dunes grow over the years,always 【3】 with the winds and changing the shape.Most of them are only a few feet tall,but they can grow to be several hundred feet 【4】 . There is, however,much more to a desert than sand.In the deserts of the southwestern United States, cliffs and deep valleys were formed from thick mud that once lay 【5】 a sea more than millions of years ago.Over the centuries, the water dried up. Wind, sand, rain, heat and cold all wore away at the 【6】 rocks. The faces of the desert mountains are always changing ——very, very slowly;—— :as these forces of nature continue to work on the rock. Most deserts have a 【7】 variety of life. There are plants, animals and 【8】 that have adapted to life in the desert.During the heat of the day, a visitor may see very 【9】 signs of living things, but as the air begins to cool in the evening, the desert comes to life. As the sun begins to rise again in the sky, the desert once again becomes quiet and 【10】 .
Deserts are found 【1】 there is lite rainfall or where rain for a whole year falls in only a few weeks' time. Ten inches of rain may be enough for many plants to 【2】 if the rain is spread throughout the year.If it falls within one or two months and the rest of the year is dry, those plants may die and a desert may form. Sand begins as tiny pieces of rock that get smaller and smaller as wind and weather wear them down. Sand dunes are formed as winds move the sand across the desert.Bit by bit, the dunes grow over the years,always 【3】 with the winds and changing the shape.Most of them are only a few feet tall,but they can grow to be several hundred feet 【4】 . There is, however,much more to a desert than sand.In the deserts of the southwestern United States, cliffs and deep valleys were formed from thick mud that once lay 【5】 a sea more than millions of years ago.Over the centuries, the water dried up. Wind, sand, rain, heat and cold all wore away at the 【6】 rocks. The faces of the desert mountains are always changing ——very, very slowly;—— :as these forces of nature continue to work on the rock. Most deserts have a 【7】 variety of life. There are plants, animals and 【8】 that have adapted to life in the desert.During the heat of the day, a visitor may see very 【9】 signs of living things, but as the air begins to cool in the evening, the desert comes to life. As the sun begins to rise again in the sky, the desert once again becomes quiet and 【10】 .
Deserts are found 【1】 there is lite rainfall or where rain for a whole year falls in only a few weeks' time. Ten inches of rain may be enough for many plants to 【2】 if the rain is spread throughout the year.If it falls within one or two months and the rest of the year is dry, those plants may die and a desert may form. Sand begins as tiny pieces of rock that get smaller and smaller as wind and weather wear them down. Sand dunes are formed as winds move the sand across the desert.Bit by bit, the dunes grow over the years,always 【3】 with the winds and changing the shape.Most of them are only a few feet tall,but they can grow to be several hundred feet 【4】 . There is, however,much more to a desert than sand.In the deserts of the southwestern United States, cliffs and deep valleys were formed from thick mud that once lay 【5】 a sea more than millions of years ago.Over the centuries, the water dried up. Wind, sand, rain, heat and cold all wore away at the 【6】 rocks. The faces of the desert mountains are always changing ——very, very slowly;—— :as these forces of nature continue to work on the rock. Most deserts have a 【7】 variety of life. There are plants, animals and 【8】 that have adapted to life in the desert.During the heat of the day, a visitor may see very 【9】 signs of living things, but as the air begins to cool in the evening, the desert comes to life. As the sun begins to rise again in the sky, the desert once again becomes quiet and 【10】 .
Deserts are found 【1】 there is lite rainfall or where rain for a whole year falls in only a few weeks' time. Ten inches of rain may be enough for many plants to 【2】 if the rain is spread throughout the year.If it falls within one or two months and the rest of the year is dry, those plants may die and a desert may form. Sand begins as tiny pieces of rock that get smaller and smaller as wind and weather wear them down. Sand dunes are formed as winds move the sand across the desert.Bit by bit, the dunes grow over the years,always 【3】 with the winds and changing the shape.Most of them are only a few feet tall,but they can grow to be several hundred feet 【4】 . There is, however,much more to a desert than sand.In the deserts of the southwestern United States, cliffs and deep valleys were formed from thick mud that once lay 【5】 a sea more than millions of years ago.Over the centuries, the water dried up. Wind, sand, rain, heat and cold all wore away at the 【6】 rocks. The faces of the desert mountains are always changing ——very, very slowly;—— :as these forces of nature continue to work on the rock. Most deserts have a 【7】 variety of life. There are plants, animals and 【8】 that have adapted to life in the desert.During the heat of the day, a visitor may see very 【9】 signs of living things, but as the air begins to cool in the evening, the desert comes to life. As the sun begins to rise again in the sky, the desert once again becomes quiet and 【10】 .
Deserts are found 【1】 there is lite rainfall or where rain for a whole year falls in only a few weeks' time. Ten inches of rain may be enough for many plants to 【2】 if the rain is spread throughout the year.If it falls within one or two months and the rest of the year is dry, those plants may die and a desert may form. Sand begins as tiny pieces of rock that get smaller and smaller as wind and weather wear them down. Sand dunes are formed as winds move the sand across the desert.Bit by bit, the dunes grow over the years,always 【3】 with the winds and changing the shape.Most of them are only a few feet tall,but they can grow to be several hundred feet 【4】 . There is, however,much more to a desert than sand.In the deserts of the southwestern United States, cliffs and deep valleys were formed from thick mud that once lay 【5】 a sea more than millions of years ago.Over the centuries, the water dried up. Wind, sand, rain, heat and cold all wore away at the 【6】 rocks. The faces of the desert mountains are always changing ——very, very slowly;—— :as these forces of nature continue to work on the rock. Most deserts have a 【7】 variety of life. There are plants, animals and 【8】 that have adapted to life in the desert.During the heat of the day, a visitor may see very 【9】 signs of living things, but as the air begins to cool in the evening, the desert comes to life. As the sun begins to rise again in the sky, the desert once again becomes quiet and 【10】 .
Can you imagine travelling to work in a one-man submarine? Scientists believe that someday one-man submarines will be as numerous as automobiles 【1】 today. A scientist says"One day soon, men will walk on the ocean floor as they do on the street." Perhaps during your lifetime people will travel,work, and live in the 【2】 Ships carrying oil and articles of trade will move beneath the ocean. Passenger ships will be built to travel undersea, 【3】 storms cannot delay them or make people seasick. Special underwater ships will be designed for mining, fishing, and 【4】 unknown areas. However, if we want to make all this come true, 【5】 the first step,the human problems associated with living in the ocean will need to be studied in detail. Many of these problems are the same as the problems of living in 【6】 : pressure, lack of oxygen, and weightlessness. Already scientists have begun to study these problems. Although some experiments have been made, many puzzling questions 【7】 unanswered. Mans warm blood makes it difficult for him to live long in the sea 【8】 some kind of warmth. Can our blood be changed to suit new water surroundings? What will happen to our muscles if we live in the water very long? Will bones become weak and our blood pressure change? Scientists are 【9】 for answers. They are trying to make it possible for people to live comfortably under the sea, 【10】 from the crowded and noisy cities on land.
Can you imagine travelling to work in a one-man submarine? Scientists believe that someday one-man submarines will be as numerous as automobiles 【1】 today. A scientist says"One day soon, men will walk on the ocean floor as they do on the street." Perhaps during your lifetime people will travel,work, and live in the 【2】 Ships carrying oil and articles of trade will move beneath the ocean. Passenger ships will be built to travel undersea, 【3】 storms cannot delay them or make people seasick. Special underwater ships will be designed for mining, fishing, and 【4】 unknown areas. However, if we want to make all this come true, 【5】 the first step,the human problems associated with living in the ocean will need to be studied in detail. Many of these problems are the same as the problems of living in 【6】 : pressure, lack of oxygen, and weightlessness. Already scientists have begun to study these problems. Although some experiments have been made, many puzzling questions 【7】 unanswered. Mans warm blood makes it difficult for him to live long in the sea 【8】 some kind of warmth. Can our blood be changed to suit new water surroundings? What will happen to our muscles if we live in the water very long? Will bones become weak and our blood pressure change? Scientists are 【9】 for answers. They are trying to make it possible for people to live comfortably under the sea, 【10】 from the crowded and noisy cities on land.
Can you imagine travelling to work in a one-man submarine? Scientists believe that someday one-man submarines will be as numerous as automobiles 【1】 today. A scientist says"One day soon, men will walk on the ocean floor as they do on the street." Perhaps during your lifetime people will travel,work, and live in the 【2】 Ships carrying oil and articles of trade will move beneath the ocean. Passenger ships will be built to travel undersea, 【3】 storms cannot delay them or make people seasick. Special underwater ships will be designed for mining, fishing, and 【4】 unknown areas. However, if we want to make all this come true, 【5】 the first step,the human problems associated with living in the ocean will need to be studied in detail. Many of these problems are the same as the problems of living in 【6】 : pressure, lack of oxygen, and weightlessness. Already scientists have begun to study these problems. Although some experiments have been made, many puzzling questions 【7】 unanswered. Mans warm blood makes it difficult for him to live long in the sea 【8】 some kind of warmth. Can our blood be changed to suit new water surroundings? What will happen to our muscles if we live in the water very long? Will bones become weak and our blood pressure change? Scientists are 【9】 for answers. They are trying to make it possible for people to live comfortably under the sea, 【10】 from the crowded and noisy cities on land.
Can you imagine travelling to work in a one-man submarine? Scientists believe that someday one-man submarines will be as numerous as automobiles 【1】 today. A scientist says"One day soon, men will walk on the ocean floor as they do on the street." Perhaps during your lifetime people will travel,work, and live in the 【2】 Ships carrying oil and articles of trade will move beneath the ocean. Passenger ships will be built to travel undersea, 【3】 storms cannot delay them or make people seasick. Special underwater ships will be designed for mining, fishing, and 【4】 unknown areas. However, if we want to make all this come true, 【5】 the first step,the human problems associated with living in the ocean will need to be studied in detail. Many of these problems are the same as the problems of living in 【6】 : pressure, lack of oxygen, and weightlessness. Already scientists have begun to study these problems. Although some experiments have been made, many puzzling questions 【7】 unanswered. Mans warm blood makes it difficult for him to live long in the sea 【8】 some kind of warmth. Can our blood be changed to suit new water surroundings? What will happen to our muscles if we live in the water very long? Will bones become weak and our blood pressure change? Scientists are 【9】 for answers. They are trying to make it possible for people to live comfortably under the sea, 【10】 from the crowded and noisy cities on land.
Can you imagine travelling to work in a one-man submarine? Scientists believe that someday one-man submarines will be as numerous as automobiles 【1】 today. A scientist says"One day soon, men will walk on the ocean floor as they do on the street." Perhaps during your lifetime people will travel,work, and live in the 【2】 Ships carrying oil and articles of trade will move beneath the ocean. Passenger ships will be built to travel undersea, 【3】 storms cannot delay them or make people seasick. Special underwater ships will be designed for mining, fishing, and 【4】 unknown areas. However, if we want to make all this come true, 【5】 the first step,the human problems associated with living in the ocean will need to be studied in detail. Many of these problems are the same as the problems of living in 【6】 : pressure, lack of oxygen, and weightlessness. Already scientists have begun to study these problems. Although some experiments have been made, many puzzling questions 【7】 unanswered. Mans warm blood makes it difficult for him to live long in the sea 【8】 some kind of warmth. Can our blood be changed to suit new water surroundings? What will happen to our muscles if we live in the water very long? Will bones become weak and our blood pressure change? Scientists are 【9】 for answers. They are trying to make it possible for people to live comfortably under the sea, 【10】 from the crowded and noisy cities on land.
Can you imagine travelling to work in a one-man submarine? Scientists believe that someday one-man submarines will be as numerous as automobiles 【1】 today. A scientist says"One day soon, men will walk on the ocean floor as they do on the street." Perhaps during your lifetime people will travel,work, and live in the 【2】 Ships carrying oil and articles of trade will move beneath the ocean. Passenger ships will be built to travel undersea, 【3】 storms cannot delay them or make people seasick. Special underwater ships will be designed for mining, fishing, and 【4】 unknown areas. However, if we want to make all this come true, 【5】 the first step,the human problems associated with living in the ocean will need to be studied in detail. Many of these problems are the same as the problems of living in 【6】 : pressure, lack of oxygen, and weightlessness. Already scientists have begun to study these problems. Although some experiments have been made, many puzzling questions 【7】 unanswered. Mans warm blood makes it difficult for him to live long in the sea 【8】 some kind of warmth. Can our blood be changed to suit new water surroundings? What will happen to our muscles if we live in the water very long? Will bones become weak and our blood pressure change? Scientists are 【9】 for answers. They are trying to make it possible for people to live comfortably under the sea, 【10】 from the crowded and noisy cities on land.
Can you imagine travelling to work in a one-man submarine? Scientists believe that someday one-man submarines will be as numerous as automobiles 【1】 today. A scientist says"One day soon, men will walk on the ocean floor as they do on the street." Perhaps during your lifetime people will travel,work, and live in the 【2】 Ships carrying oil and articles of trade will move beneath the ocean. Passenger ships will be built to travel undersea, 【3】 storms cannot delay them or make people seasick. Special underwater ships will be designed for mining, fishing, and 【4】 unknown areas. However, if we want to make all this come true, 【5】 the first step,the human problems associated with living in the ocean will need to be studied in detail. Many of these problems are the same as the problems of living in 【6】 : pressure, lack of oxygen, and weightlessness. Already scientists have begun to study these problems. Although some experiments have been made, many puzzling questions 【7】 unanswered. Mans warm blood makes it difficult for him to live long in the sea 【8】 some kind of warmth. Can our blood be changed to suit new water surroundings? What will happen to our muscles if we live in the water very long? Will bones become weak and our blood pressure change? Scientists are 【9】 for answers. They are trying to make it possible for people to live comfortably under the sea, 【10】 from the crowded and noisy cities on land.
Can you imagine travelling to work in a one-man submarine? Scientists believe that someday one-man submarines will be as numerous as automobiles 【1】 today. A scientist says"One day soon, men will walk on the ocean floor as they do on the street." Perhaps during your lifetime people will travel,work, and live in the 【2】 Ships carrying oil and articles of trade will move beneath the ocean. Passenger ships will be built to travel undersea, 【3】 storms cannot delay them or make people seasick. Special underwater ships will be designed for mining, fishing, and 【4】 unknown areas. However, if we want to make all this come true, 【5】 the first step,the human problems associated with living in the ocean will need to be studied in detail. Many of these problems are the same as the problems of living in 【6】 : pressure, lack of oxygen, and weightlessness. Already scientists have begun to study these problems. Although some experiments have been made, many puzzling questions 【7】 unanswered. Mans warm blood makes it difficult for him to live long in the sea 【8】 some kind of warmth. Can our blood be changed to suit new water surroundings? What will happen to our muscles if we live in the water very long? Will bones become weak and our blood pressure change? Scientists are 【9】 for answers. They are trying to make it possible for people to live comfortably under the sea, 【10】 from the crowded and noisy cities on land.
Can you imagine travelling to work in a one-man submarine? Scientists believe that someday one-man submarines will be as numerous as automobiles 【1】 today. A scientist says"One day soon, men will walk on the ocean floor as they do on the street." Perhaps during your lifetime people will travel,work, and live in the 【2】 Ships carrying oil and articles of trade will move beneath the ocean. Passenger ships will be built to travel undersea, 【3】 storms cannot delay them or make people seasick. Special underwater ships will be designed for mining, fishing, and 【4】 unknown areas. However, if we want to make all this come true, 【5】 the first step,the human problems associated with living in the ocean will need to be studied in detail. Many of these problems are the same as the problems of living in 【6】 : pressure, lack of oxygen, and weightlessness. Already scientists have begun to study these problems. Although some experiments have been made, many puzzling questions 【7】 unanswered. Mans warm blood makes it difficult for him to live long in the sea 【8】 some kind of warmth. Can our blood be changed to suit new water surroundings? What will happen to our muscles if we live in the water very long? Will bones become weak and our blood pressure change? Scientists are 【9】 for answers. They are trying to make it possible for people to live comfortably under the sea, 【10】 from the crowded and noisy cities on land.
Can you imagine travelling to work in a one-man submarine? Scientists believe that someday one-man submarines will be as numerous as automobiles 【1】 today. A scientist says"One day soon, men will walk on the ocean floor as they do on the street." Perhaps during your lifetime people will travel,work, and live in the 【2】 Ships carrying oil and articles of trade will move beneath the ocean. Passenger ships will be built to travel undersea, 【3】 storms cannot delay them or make people seasick. Special underwater ships will be designed for mining, fishing, and 【4】 unknown areas. However, if we want to make all this come true, 【5】 the first step,the human problems associated with living in the ocean will need to be studied in detail. Many of these problems are the same as the problems of living in 【6】 : pressure, lack of oxygen, and weightlessness. Already scientists have begun to study these problems. Although some experiments have been made, many puzzling questions 【7】 unanswered. Mans warm blood makes it difficult for him to live long in the sea 【8】 some kind of warmth. Can our blood be changed to suit new water surroundings? What will happen to our muscles if we live in the water very long? Will bones become weak and our blood pressure change? Scientists are 【9】 for answers. They are trying to make it possible for people to live comfortably under the sea, 【10】 from the crowded and noisy cities on land.
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