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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A. 1 m/s B. 2 m/s C. 3 m/s D. 4 m/s
The amount of ozone in the upper atmosphere
A. contributes to smog. B. shields the earth from radiation from ultraviolet light. C. increases with the presence of chlorofluorocarbons. D. All of these statements are correct.
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?
What will be an ideal response?
Cap and Trade is a system that ________.
What will be an ideal response?