Earth

What is the hardest mineral known on Earth called?

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What is the place where an air mass forms called?
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What type of scientist studies microscopic plants and animals?
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How old is the sun estimated to be?
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What is an underwater boat with its own power and air supply called?
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What are solids contained in the gas that issues from a volcano called?
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What type of clouds are thick and puffy and can sometimes turn into thunderstorms?
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How many moons does Earth have?
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On which canal would a traveler find Port Said?
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