What Causes Whirlwinds?
What Causes Whirlwinds? Whirlwinds are caused by the rising of an overheated layer of air close to the ground. Whirlwinds occur when the sun heats the air near the...
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What Is Cold-blooded Animal?
What Is Cold-blooded Animal? Many animals, such as fish, frogs, snakes and lizards, are often called “cold-blooded,” as opposed to...
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Why Are Stars Different Colors?
Why Are Stars Different Colors? Stars are many different colors because some of them are hotter than others. Stars are either red, orange, yellow, white or...
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How Can Polar Bears Stand Cold Water?
How Can Polar Bears Stand Cold Water? Despite arctic cold, the polar bear can swim in freezing water or walk about wringing wet, and still stay warm. The polar...
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What Is Global Warming?
Global Warming is the increase of Earth’s average surface temperature due to effect of greenhouse gases, such as carbon dioxide emissions from burning fossil...
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