Deserts The Extreme Earth 1st Edition

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Foreword
If you have ever visited a desert, or seen a movie or documentary set in a desert, you might believe that little, if anything, could exist in such an environment. A visitor to the Mohave Desert of California, for example, may doubt that without regular rainfall, streams, or lakes, anything other than a few well-adapted reptiles could fourish here. After all, we humans would soon perish in an environment devoid of water to drink, not to mention the toll extreme heat would play. Access to water is central to our ability to grow crops and develop industry so deserts may seem forbidding and lifeless to us at frst glance. Deserts are extreme environments that are also biologically diverse, and this contradiction makes them interesting to the scientists such as biologists, geologists, and archaeologists who study them. You might think of a desert as a vast expanse of rolling sand dunes, but many consist of a windswept stony pavement, bare bedrock, salt-covered fats, or even ice felds or Arctic tundra. What they share is the basic relationship between rainfall and evaporation. A desert is defned as a region where evaporation exceeds rainfall or, generally, one that receives less than 10 inches (25 cm) of rain per year. Because deserts receive so little rain, geologists are able to study the rocks without a lot of soil or vegetation getting in the way.
In Deserts, by Peter Aleshire, you will learn the ways deserts can differ. You will learn about the sustaining sky islands of the Sonoran Desert in Arizona and New Mexico that gather rainwater, allowing wildlife to thrive throughout the seasons as one plant community after another matures at different elevations. Another desert you will read about is the Great Basin Desert in the American Southwest where evaporation over thousands of years since the end of the last ice age caused the formation of the Great Salt Lake and the accumulation of massive amounts of salt and other minerals. Other deserts covered here are the Sahara of northern Africa with the world’s tallest sand dunes and the Arabian Desert, home to the perfectly adapted “ship of the desert” or camel.
Deserts are the product of where they are located on Earth because they are produced by climatological factors such as dry winds and rainshadows behind mountains. Because of the movement of continents due to plate tectonics, deserts now exist where forests previously grew and, often, petrifed wood has been left behind as proof of the changes caused by climate.
Aleshire’s book is an introduction to the study of deserts that will prove useful to a world where many signs point to a process of unprecedented change due to global warming. As areas of Earth are affected by extreme weather patterns, change will come. Additional rainfall may beneft some areas, while loss of regular rain may produce more arid, diffcult environments that make life harder for their inhabitants. Readers will find this book an interesting study of some of the most forbidding yet diverse areas on the planet.
Product Details
Reading level: Young Adult
Hardcover: 178 pages
Publisher: Chelsea House Publications; 1 edition (December 30, 2007)
Language: English
ISBN-10: 0816064342
ISBN-13: 978-0816064342
Product Dimensions: 9.4 x 7.6 x 0.7 inches

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Deserts The Extreme Earth 1st Edition

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