Which of the following concerning the Ogallala is FALSE?
A) It is the largest water supply in Mexico.
B) Most of it is literally being "mined."
C) It is estimated that many irrigated acres will soon have to return to dryland farming.
D) It contains as much water as one of the Great Lakes.
E) The aquifer is most abundant under the Sandhills.
Answer: A
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When Joan pushes a crate across a level floor at constant velocity, friction between the crate and the floor is
A. the same amount as her pushing force. B. less than her pushing force. C. more than her pushing force. D. none of the above
What types of rocks would be most common in the small volcano in this photograph?
A) Scoria and other vesicular basalt
B) Basalt mostly formed in lava flows
C) Felsic and intermediate lava flows
D) Welded tuff and tephra
E) None of these are correct.
How many amines have the molecular formula C3H9N?
A) 1 B) 2 C) 3 D) 4
Which statement about trophic levels is NOT true?
a. Plants are autotrophs and occupy the first trophic level. b. Detritivores consume waste products or dead bodies. c. Biomass and energy increase going up the food chain. d. There are typically fewer predators than prey in an area.