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why do clouds vary in shape
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Why Do Clouds Vary in Shape?

Clouds vary in shape according to their height and temperature, and they contain minute drops of water or ice particles or a combination of…

what causes tidal waves
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What Causes Tidal Waves?

What Causes Tidal Waves? A tidal wave is a regularly reoccurring shallow water wave caused by effects of the gravitational interactions betw

what is sea level
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What Is Sea Level?

We say that Mount McKinley in Alaska is 20,320 feet above sea level, or that Death Valley, in California, is 282 feet below sea level. And w