The most common mineral in Earth's crust is ________ and the second most common mineral is ________

A) quartz; feldspar
B) feldspar; quartz
C) silicate; carbonate
D) olivine; feldspar


B

Environmental & Atmospheric Sciences

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"Scale" relates ________ to ________

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The Antarctic Protection Act of 1990

A. establishes guidelines for mineral-resource development in Antarctica. B. sets the maximum allowable levels for Antarctic air and water pollution. C. protects the Antarctic flora and fauna. D. prohibits Antarctic mineral prospecting and development by United States citizens and companies.

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