Upper air divergence is most closely associated with surface ________
A) anticyclones
B) inversions
C) cyclones
D) isobars
E) air mass source regions
Answer: C
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Without convection, there would be no volcanoes on Earth because
A) all the convecting material spurts out at the surface. B) rising mantle material undergoes decompression melting. C) molten outer-core melts the lower continental crust. D) volcanoes sink down into Earth near down-going convention cells.
Biogeochemical cycles involve
A) only biological processes. B) heat loss from both respiration and photosynthesis. C) only geological and chemical processes. D) the cyclic movement of materials through all planetary ecosystems.
Population growth is determined by the combined effects of birthrate and death rate.
Answer the following statement true (T) or false (F)
In designing a retaining wall to support an unstable slope, the best design would be
A. any of these; all would be equally effective. B. a high, thin, impermeable wall. C. a high, thin wall with drainage holes. D. a short, stout wall at the foot of the slope.