Earth

How are pockets of air in soil made?

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What layer of the Earth's atmosphere contains the ozone layer?
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What are minerals found in high quantities and worth mining called?
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What is the opening that spews out lava called?
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What is sedimentary rock composed primarily of sand-sized grains?
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What was the Great Plains of the U.S. called in the 1930's because of erosion?
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What are rocks made from?
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What is another name for an estuary?
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Which of these types of energy is cleanest and causes the least pollution?
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