The grinding of rock against rock by a glacier produces a very fine sediment called ________.
A. tillite
B. till
C. rock dust
D. rock flour
E. glacier mist
Answer: D
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Most earthquake destruction results from
A) primary (P) waves. B) secondary (S) waves. C) surface waves. D) acoustic waves.
What factors led to starvation in the mid-1970s across Africa?
A) drought in the Sahel B) colonial legacy C) export crops D) all of the above E) none of the above
Fishing down the food chain refers to
A. the practice of line fishing where only mature adult fish are harvested. B. using trawlers with large nets to harvest marine resources. C. the practice of fishing top predators nearly to extinction then moving on to smaller, less desirable fish. D. the practice of fishing down at the bottom of the food chain.
The Earth's climate cycles between warmer and colder periods
Indicate whether the statement is true or false