Unconformities represent
A) a gap in the geologic record
B) a time when the rock sequence was below sea level
C) a period of igneous intrusion
D) an example of the principle of superposition
A
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In certain areas of the open sea, winds, ocean currents, and other factors cause water to come up from the depths to the surface, bringing nutrient from the ocean bottom. This process is called a(n) ____.
A. downdraft B. updraft C. El Niño D. La Niña E. upwelling
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.
Unlike Cenozoic mammals, mammals of the Mesozoic were uniformly small
a. True b. False
Judge the following sentence according to the criteria given below: When studying alternating sandstone and shale beds prior to 1900,
sedimentologists interpreted that the sediment did not quietly settle out to the seafloor because they saw scoured bases on the graded beds and current-formed cross-beds. 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.