On average, close to ________ percent of the commercial catch is discarded as bycatch
A) 10
B) 15
C) 20
D) 25
E) 50
D
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The loss of volatile elements in organic material, leaving only a thin dark film behind, is the
process of _______. Fill in the blank(s) with the appropriate word(s).
Compression causes
A) an increase in elevation because it forms reverse faults. B) an increase in elevation because it shortens and thickens the lower crust. C) a decrease in elevation because it forms reverse faults. D) a decrease in elevation because it shortens and thickens the lower crust.
During the afternoon, the greatest temperature difference between surface air and the air several meters above occurs on a
a. ?clear, calm afternoon. b. ?clear, windy afternoon. c. ?cloudy, calm afternoon. d. ?cloudy, windy afternoon. e. ?cold, windy afternoon.
Why does hot water come out of hydrothermal vents on the flanks of the mid-ocean ridges?
a) Water is released from the mid-ocean ridge magma and oozes out of the crust b) Flows of hot lava on the sea floor cause seawater to be heated c) Sea water percolates downward through cracks in the crust, is heated in the hot deeper crust, and rises back up to the surface through other cracks d) Chemical reactions result in dehydration of the crust when freshwater is in contact with fresh basalt near the mid-ocean ridge e) Seawater percolates downward in the crust through cracks and flashes to steam on contact with hot lava deep in the crust