Which of the following describes the degree to which geologic processes have concentrated a mineral resource above its average concentration in Earth's crust?
A. enrichment factor
B. geologic factor
C. concentration level
D. relative abundance
E. economic potential
Answer: A
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What is the theory of first effective settlement and how does it help to explain the residual impacts of the English settlers at Jamestown and Massachusetts Bay Colony on North American cultural landscapes?
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Cap and Trade is a system that ________.
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What is the velocity of a stream with a cross sectional area of 300 m2 and a discharge of 600 m3/s?
A. 1 m/s B. 2 m/s C. 3 m/s D. 4 m/s