Metamorphic rock is formed by changing the nature of minerals of preexisting rocks. What could the preexisting rocks be?

A) metamorphic
B) igneous
C) metamorphic, igneous, or sedimentary
D) sedimentary


Answer: C

Environmental & Atmospheric Sciences

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Carbon dioxide currently has a concentration of ________ in the homosphere

A) 580 ppm B) 270 ppm C) 400 ppm D) 315 ppm

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The most abundant gases in Earth's present day atmosphere (by volume) are ____

A) carbon dioxide and nitrogen B) oxygen and water vapor C) nitrogen and oxygen D) oxygen and helium

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Describe or sketch how an erosional floodplain develops

What will be an ideal response?

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Because of the concentration of people, automobiles, business enterprises, and industries in cities, they can never be sustainable

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences