Which of the following statements describes the mid-Holocene climatic optimum?
A. Continental ice sheets began to melt.
B. Alpine glaciers began to advance down river valleys.
C. Average temperatures were colder than at present.
D. The climate favoured the development of certain plants.
Answer: D
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Which of the following terms refers to a tornado vortex that does not touch the ground?
A. roll cloud B. funnel cloud C. mesocyclone D. wall cloud
Grazers are well suited to savannas because
A) none of their natural predators live there. B) they are able to migrate seasonally toward the wetter areas. C) they can pull up grasses there by the roots. D) the grasses there are ephemeral.
Seismology has produced a great amount of information about:a
the mechanisms of plate tectonics. b. the physical and chemical state of Earth's interior. c. the causes of mountain building. d. earthquakes. e. all of the above
Nuclear power has a low net energy yield.
Answer the following statement true (T) or false (F)