Hot spots in oceanic settings typically produce
A. island arcs.
B. flood basalts in the middle of a continent.
C. huge caldera explosions.
D. lines or clusters of volcanic islands.
Answer: D
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Judge the following sentence according to the criteria given below: The decline of glacial ice in alpine
and ice-cap glaciers from mid- and low-latitudes is not significant BECAUSE only very few glaciers have been surveyed. a. The assertion and the reason are both correct, and the reason is valid. b. The assertion and the reason are both correct, but the reason is invalid. c. The assertion is correct, but the reason is incorrect. d. The assertion is incorrect, but the reason is correct. e. Both the assertion and the reason are incorrect
You would expect only slight physical and chemical weathering under natural conditions of
(a) lower mean annual rainfall and temperatures. (b) temperatures below freezing. (c) higher temperatures and lower precipitation. (d) extreme cold and high precipitation.
The productivity of an ecosystem refers to the
A. amount of food consumed by the organisms per unit space. B. reproductive output. C. amount of biological material produced during a certain period of time. D. average number of offspring produced per adult female per unit time.
The best records of ancient life are those for the last 600 million years, when organisms with hard parts became widespread.
Answer the following statement true (T) or false (F)