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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, 23.06.2019 00:30
In the following diagram, four different index fossils are labeled: which of the labeled fossils comes from the oldest organism? a b c d
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Geography, 23.06.2019 18:00
Which of the layers of the earth has the following three characteristics? i. it is a solid outer layer. ii. it is between 3 and 30 miles thick. iii. it is separated into plates. a. the outer core b. the inner core c. the mantle d. the crust
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Geography, 24.06.2019 06:50
Pollution from one country can affect another. for example, south korea is especially affected by pollution and dust storms that come from
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