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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
Answers: 2
Geography, 22.06.2019 21:30
Stages 1 and 4 of the demographic transition are similar in that
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Geography, 23.06.2019 00:40
Which of the following statements best characterizes changes to agriculture in the united states since 1900? a. increased mechanization has reduced the need for labor.b. increased mechanization has increased the need for water, thereby increasing the need for labor.increased mechanization has increased the use of land, thereby increasing the need for labor.d. increased mechanization has increased food production, thereby increasing the need for labor. select the best answer from the choices provided.
Answers: 3
Geography, 23.06.2019 01:30
In the late 1990s, brazil’s poor people protested about crowded cities land distribution mining permits industrial pollution
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What is the biggest lake in Africa?...
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