Earth

What mineral makes both sapphires and rubies when cut and polished?

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When a meander is cut off, what is formed?
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What type of clouds surround the eye of a hurricane?
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What is the organized history of the Earth called?
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Slush is a combination of what with snow?
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Although beaches can be comprised of any particle, the majority of them consist of what?
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What breaks when its height is 3/4 of its depth?
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What activity allows humans to go underwater with oxygen tanks and a wetsuit?
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What is a scientist who specializes in soil and crops called?
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