Earth

What are the soil layers called?

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Every second, 100,000 cubic feet of water pours over what?
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Which is not a source of aluminum ore?
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What is the boiling point of water as measured on the Celsius scale?
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Which of the following types of trees does not have lobed leaves?
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What is the name of the reddish soils of the humid tropics?
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What reef is the largest living structure on Earth?
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Which of these is a soil that is better to grow plants in?
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What is another name for permanently frozen ground?
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