Anthropogenic means ________ in terms of climate change
A) "good for humans"
B) "caused by humans"
C) "fixed by humans"
D) "made by Nature"
E) "changed by the biosphere"
Answer: B
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Although the last major ice sheets receded 10,000 years ago, pollen and tree ring data exist to indicate that since 6,000
years ago, there have been small glacial advances and retreats. a. True b. False
Positive feedback tends to amplify or encourage response in system operations
Indicate whether the statement is true or false
If a sound pulse is sent vertically downward into the sea and its reflected echo from the seafloor returns 6 seconds later, the depth of the water is ________ meters. (The average speed of sound in seawater is 1500 m/sec.)
A. 3000 B. 9000 C. 6000 D. 4500 E. 12,000
How well a concrete structure withstands an earthquake depends on
A. the length of the main shock. B. the material on which the structure is built. C. the basic design of the structure. D. All of the choices are correct.