Minerals such as mica, quartz, and feldspar ____
A)can occur only as igneous rocks
B)can occur only as metamorphic rocks
C)can occur as both igneous and metamorphic rocks
D)are useful index minerals for metamorphic rocks that formed from clay-rich rocks
E)all have the same chemical formula
C
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Lakes or areas of the ocean that have a small supply of nutrients, and thus low productivity, are referred to as
A. autotrophic. B. eutrophic. C. oligotrophic. D. mesotrophic. E. abyssal.
What is the relationship between seafloor spreading and reversals in the Earth's magnetic field?
What will be an ideal response?
Which statement best represents the views of a mainstream economist from a technologically advanced country?
A. The Earth can support a world population of 30 billion people without serious environmental harm. B. The Earth can support a world population of 300 billion people without serious environmental harm. C. The Earth can support a world population of 30 billion people but with serious environmental harm. D. If the population of the earth exceeds 7 billion, we will experience a major human dieback.
The color to which human eyes are most sensitive is
A. blue. B. yellow-green. C. red. D. all the same