Earth

What are the three main categories of rock?

More Questions from Earth
About what percentage of solar radiation is absorbed by Earth's atmosphere, oceans and land masses?
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On which canal would a traveler find Port Said?
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What direction does a compass needle point to?
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Which is the parent rock of marble?
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What layer of the Earth's atmosphere contains the ozone layer?
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Groundhog Day predicts how long what will last?
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What is the repeating cycle of precipitation, condensation and evaporation called?
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Earthquakes sometimes cause "tidal" what?
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