Earth

What is the hardest mineral known on Earth called?

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What is the study of plant life called?
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A line of equal or constant air temperature is what?
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What is the main cause of caves?
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Most minerals may be identified using the following methods except which?
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What type of climate word would you use to describe the climate around your house?
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John Glenn first orbited the earth in what year?
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What is the energy released from the sun called?
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Who published the book "The Theory of the Earth" in 1795?
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