Earth

Which is heavier, cold air or warm air?

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What are Earth's seven large land masses called?
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In weather, "mean" means what?
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What word means to degrade naturally?
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Earth is located in which galaxy?
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How many times does lightning strike the Earth every second?
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In which country is Fiordland, which contains the Milford Sound fiord, located?
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Which is the smallest planet in Earths solar system?
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What type of landscaping is used to help conserve moisture?
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