About what percentage of Earth's surface is land?
A. 75 percent
B. 50 percent
C. 18 percent
D. 29 percent
D. 29 percent
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A heavy and a light object released from the same height in a vacuum have equal
A) weights. B) momenta. C) energies. D) all of the above E) none of the above
Arsenic contamination in groundwater stems from human activities
Indicate whether the statement is true or false
Stratovolcanoes have relatively steep sides because ____
a. ?they are composed of compacted ash b. ?they are composed of strong basalt with little ash c. ?their magma has moderate viscosity so lavas flow a short distance before cooling d. ?their explosions are fast and catastrophically explosive e. ?they grow slowly, as new magma pushes them higher, often without eruption
The coldest of all air masses is ____
A) cA B) mP C) cT D) cP