Earth

What is the top layer of the soil called?

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How old do scientists think the Earth is?
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What are large volcanoes that rise from the sea floor called?
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78% of the earth's atmosphere is composed of which gas?
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What type of glacier is Greenland or Antarctica called?
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What cloud has a flat, sheetlike appearance?
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A phytotoxin is a poison produced from what?
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From which does the Global Positioning System receive its information?
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What produces more energy than all the world's nuclear weapons combined?
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