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Impact!
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Elizabeth Rusch |
"Asteroids come in all shapes and sizes--and hit our planet in them, too. But what happens if a catastrophically large one approaches earth? By looking on the ground at historical asteroid craters an… |
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Battling extinction
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Tamra Orr |
"Find out how the scientific method can be used to help the endangered whooping crane from going extinct."-- |
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Our endangered planet
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Mary King Hoff |
Describes the delicate ecological balance among all living things on land, the damage done by humanity in contributing to the extinction of various species, and ways of preventing further harm. |
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