Which of the following statements is not true of the sulfur cycle?
A) Most sulfur is found in rocks and minerals.
B) Unlike nitrogen and carbon, organisms do not require or contain sulfur.
C) Atmospheric sulfur dioxide is contributed when humans burn fossil fuels.
D) A natural source of sulfate in soils is the weathering of rocks.
B
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In 1868, the USS Wateree was carried several miles inland by a tsunami along the coast of ________.
A. Hawaii B. Chile C. Alaska D. Baja California E. Mexico
Condensation nuclei are important in the atmosphere because
a. ?they provide most of the minerals found in water. b. ?they make it easier for condensation to occur in the atmosphere. c. ?they are the sole producers of smog. d. ?they filter out sunlight. e. ?they provide the only means we have of tracking wind motions.
The first jawed fish were the
a. placoderms. d. chondrichthyes. b. acanthodians. e. agnatha. c. ostracoderms.
Which of the following occurs when mountain belts are eroded?
A. Erosion is accompanied by isostatic rebound. B. Deep metamorphic and plutonic rocks can be uplifted to the surface. C. The continental crust becomes thinner. D. All of these.