Pyroclastic flows primarily contain pumice, vesicular pyroclastic material, and ________
A) volcanic mudslides called lahars
B) a cloud of low-density hot expanding gases
C) low viscosity lava flows
D) ultramafic rock debris
Answer: B
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A severe reduction in wetlands in the San Joaquin Valley of California played a significant role in the
severity of the 1977 duststorm. What caused the reduction of wetlands? What will be an ideal response?
Single-celled microscopic plants called diatoms make up the largest biomass in the oceans of the
world. Indicate whether the statement is true or false.
According to Figure 19.25, the largest volume of sediment delivered to this section of beach in central California comes from
A) longshore current. B) wind transport. C) coastal erosion. D) river transport.
Which substance has the greatest density?
A. Warm salt water B. Ice C. Warm fresh water D. Cold salt water E. Cold fresh water