Earth
What is another name for permanently frozen ground?
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What event can cause much damage from the shaking of the Earth's crust?
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What is the boundary between two air masses called?
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In the United States, summer officially begins in which month?
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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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The coldest recorded temperature on Earth, -128 degrees F., was taken where?
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Rapidly descending air beneath a thunderstorm is what?
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