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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, 23.06.2019 18:00
Which ecosystem best fits the characteristics listed below? which ecosystem best fits the characteristics listed below? ii. seasonal migrations of millions of wildebeests, zebras, and elephants iii. large numbers of predators, such as lions iv. acacia trees and grasses a. the congo rainforest b. the african mangroves c. the serengeti grasslands d. the sahel
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Geography, 25.06.2019 01:30
Deposition is a a. destructive event b. constructive event c. destructive process d. constructive process
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Geography, 25.06.2019 02:20
Which of the following arab countries was attacked by its northern neighbor,iraq,in 1990?
Answers: 1
Simplifying the i[tex]2 \sqrt{ - 49} [/tex]...
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