Earth
What is the very bottom soil horizon called?
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How was the 12-mile limit of a country's boundary set?
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What substance can layers of decayed plants form over time?
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Which word means to "filter down through the soil horizons"?
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What is a comparison of air water vapor to amounts of vapor at a given temperature called?
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What was the most common type of rock to be found during the Precambrian Period?
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Which is the smallest planet in Earths solar system?
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How long does it take for the Earth to rotate around completely on its axis?
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