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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 01:20
Scientists think that convection currents flow in earth’s a. continents. b. mantle. c. lithosphere. d. inner core.
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Geography, 23.06.2019 11:30
Which statement about portugal is not true? a. it granted independence to its last colony in 1975 b. it has avoided conflict with spain c. it was a leader in european world exploration in the 1400s d. its economy is changing from agricultural to industrial b. it has avoided conflict with spain
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Geography, 23.06.2019 19:30
Which statement best describes how chemical equations demonstrate conservation of mass?
Answers: 1
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