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Geography, 22.06.2019 14:40, thezbell
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
Answers: 2
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Geography, 23.06.2019 19:20, LILYTH8413
Read the article titled "castro resigns." why did the us impose trade sanctions against cuba in 1962?
Answers: 2
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An example of interaction in an ecosystem is
a. human population growth
b....
a. human population growth
b....
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