Earth

What periods of the Earth's history had glaciers covering a lot of the Earth?

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What is the trapping of the sun's solar energy and radiation called?
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What were water mills used for in the 1700's in Europe?
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What is the longest river in Europe?
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What organic material is formed from decaying organisms that mix with rocks?
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Which word means to "filter down through the soil horizons"?
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Which of the world's oceans is larger than all of the Earth's land area combined?
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What kind of waves does an earthquake produce?
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What is the very sticky form of clay till called?
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