Which of the following is not a base?
A) HPO42-
B) OH-
C) NH3
D) None, they are all bases.
D
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Which of the following conditions refers to a maritime polar air mass that reaches the Pacific Coast?
A. warm air B. absolutely unstable air C. moist air D. absolutely stable air
A prairie was covered by grasses and wildflowers. A farmer removed this native vegetation so he could plow the land and plant crops. For years, normal rain fell and the farm thrived
But after a few years of drought, the crops died and the topsoil on the farm eroded. Explain how the farmer's use of the land led to the erosion that occurred there.
Currently, which of the following primary energy sources accounts for the least global consumption?
A) gas B) renewable energy C) hydropower D) wood E) nuclear
The unsaturated zone is ________.
A. a zone of high biological activity located along the water table B. the zone of capillary action adjacent to the water table C. the zone at the ground surface that includes the soil profile D. the zone above the water table E. the zone of mixing at the water table