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
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The dew point is usually ________ on a humid day compared to a dry day.
A. the same B. higher C. more changeable D. lower
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.
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
Africa's economies are largely centered on the production of textiles
Indicate whether the statement is true or false