Earth

What are the three main categories of rock?

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What is compressed moss that turns blackish brown called?
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Cumulus and stratus are types of what?
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What kind of tides are influenced by the moon and sun?
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What storm produces lightning?
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What famed rock is 1396 feet high, 2.75 miles long, and .25 miles wide?
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What word means to degrade naturally?
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What is another name for an estuary?
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What is the nickname of Katmai in Alaska?
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