Most substances ________ in density as they begin to freeze. However, as the temperature of pure water reaches 4oC it ________ in density, and as it freezes it ________ in density
a. increase; increases; decreases
b. decrease; decreases; decreases
c. decrease; decreases; increases
d. increase; increases; increases
a
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It has been proposed that the reason that the Pacific Ocean has many more coral reefs than the Atlantic Ocean is that
A) the Atlantic Ocean is too saline for many coral species. B) the ocean currents in the Atlantic are too swift to allow for coral reefs to develop unimpeded. C) the last glacial advance left the Atlantic too cold to allow coral to survive. D) there are too many large rivers discharging polluted waters into the Atlantic basin to support as many coral reefs as in the Pacific, which is much larger and more immune to the pollution.
Which factor CANNOT be used to determine the depth of a debris flow in a canyon it moved through?
Indicate whether this statement is true or false. a. bark battered off the upstream sides of trees up to that height b. sand embedded in bark up to that height c. rocks lodged in tree branches up to that height d. the maximum height of sand eroded from the valley sides e. the highest rocks on natural levees deposited by the flow
Which of the following areas in the investigation terrain is least likely to cause casualties in the event of a slope failure?
A. flanks of Flattop Hill B. Bent Fence Hills with the leaning trees C. Rock Valley D. the area below Tilted Mountain
Which of the following is not a reason for the energy deficit in the polar regions?
A) low sun angle B) diffuse insolation C) up to six months without insolation D) high albedo due to snow and ice E) little seasonal variability