Answers: 2
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 15:00
Suggest two reasons why irrigation is important for human development of the desert
Answers: 1
Geography, 22.06.2019 21:00
All of the following statements about the biosphere are true except: a. light and heat from the sun do not affect the biosphere. b. the biosphere gets resources from earth's crust, hydrosphere and atmosphere. c. like "biology", the name for the biosphere comes from the greek word for life. d. the biosphere includes all living organisms on earth's surface.
Answers: 1
Geography, 23.06.2019 18:00
Which of the following regions suffers the most from acid rain? a. the area around vancouver c. the area below atlanta b. the area below detroit d. the area above montreal
Answers: 3
Where does sea-floor spreading take place? a. convergent boundaries c. oceanic volcanoes b. transfo...
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