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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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Geography, 24.06.2019 12:30
Gains you more knowledge intensify your soft skills strong ethics and grows your network
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Geography, 24.06.2019 20:50
Monk’s mound in cahokia is an enormous earthwork very near to the mississippi river. what do archaeologists believe it was used for?
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Which of earth's layers is comprised mainly of extremely hot liquid metals? a. crust b. mantle c. o...
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