What is the primary method scientists use to determine the layering of the interior of the Earth?

A) Drill cores
B) Volcanic rocks
C) Sonar
D) Seismic waves


Answer: D

Environmental & Atmospheric Sciences

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A. the same B. higher C. more changeable D. lower

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Africa's economies are largely centered on the production of textiles

Indicate whether the statement is true or false

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Carbon monoxide (CO)

A. is produced in large quantities by coal fired power plants. B. naturally combines with oxygen to produce carbon dioxide. C. persists for long periods. D. is a secondary air pollutant.

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In general, during an earthquake you should ________.

A. run outside if you are inside, and then drop, cover, and hold on B. wait to see how bad the earthquake is before deciding what to do C. run inside if you are outside, and then drop, cover, and hold on D. drop, cover, and hold on where you currently are

Environmental & Atmospheric Sciences