Earth

What is the very bottom soil horizon called?

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What is water that flows over the ground rather than seeping into it called?
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Which is heavier, cold air or warm air?
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What is a downburst covering an area smaller than 2.5 miles in diameter called?
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What kind of scientist would study rocks, minerals and mountains?
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Which is the largest planet in Earth's solar system?
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What produces more energy than all the world's nuclear weapons combined?
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What was TIROS I, launched on April 1, 1960?
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Where is the type location for the Permian Period?
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