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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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Which of the following is true of all geographic locations on earth?
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Maria is going to a hiking trip this weekend. she has been busy shopping for the trip. which of these items that she bought are a want for her?
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Why was the kennedy space center first created?
a)for unmanned space missions
b)for mis...
a)for unmanned space missions
b)for mis...
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