Wind erosion occurs by ____
A)saltation only
B)abrasion only
C)deflation only
D)saltation and abrasion
E)abrasion and deflation
E
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What is the origin of smooth troughs (T on this figure) cutting across the landscape in the Great Lakes area?
A) The areas were covered by soft marine sediments.
B) A huge flood coming from Iowa flowed toward the Great Lakes.
C) Glaciers carved out the smooth troughs.
D) All of these are correct.
What does Richter earthquake magnitude measure?
A. damage resulting from an earthquake B. displacement on faults C. energy released from earthquake D. amplitude of seismic waves on seismogram
Which statement is most correct?
a. ?Lava domes and cinder cones are always found in resurgent caldera. b. ?Lava domes often grow on the side of shield volcanoes; cinder cones often grow on the side of stratovolcanoes. c. ?Cinder cones often grow on the side of shield volcanoes; lava domes often grow on the side of stratovolcanoes. d. ?Lava domes and cinder cones can both be found around all other volcanic types. e. ?Lava domes and cinder cones are always isolated structures far from other volcanoes.
Judge the following sentence according to the criteria given below: Diatoms need strong sunlight and are found only within the upper, sunlit surface waters of the ocean BECAUSE they provide most of the silica in biogenous ooze
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.