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Geography, 21.06.2019 20:30
Using complete sentences, describe the central economic problem facing all humans. why does this require people to make choices? how can this result in opportunity costs?
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Geography, 22.06.2019 06:40
Evaporite rocks te more permeable than reef rocks true false
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Geography, 22.06.2019 14:40
Geologists know that potassium-40 decays to argon-40, with a half-life of 1.3 billion years. if an analysis of a feldspar crystal in a sample of granite shows that 75 percent of the potassium-40 atoms have decayed to form argon-40, what is the age of the granite
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The alps and Pyrenees of Western Europe and the Ural Mountains of Russia were created primarily by...
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