Earth

What is another name for permanently frozen ground?

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What is a person who exits Earth's atmosphere called?
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How many moons does Earth have?
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Al Gore made a film about what climate issue?
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What device measures the speed or force of the wind?
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What process carries minerals down into lower soil horizons?
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Which of these is the longest river in the world?
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What is the solid form of water?
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A scientist that studies the Earth's surface is called what?
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