Which of the following is NOT correct regarding coral bleaching?
A) The warming of sea-surface temperatures is a great threat to coral.
B) The 1998 El Niño event caused the die-off of an estimated 30% of the world's reefs
C) Scientists have identified the reasons polyps eject their algae.
D) Coral reefs are under pressure from overfishing, pollution, sedimentation, and global warming.
C
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Which of the following is true of flood irrigation?
a. It relies solely on water that falls directly on the crop fields in the form of precipitation. b. It results in 40% inefficient loss of the water applied. c. It is the primary form of irrigation used in China. d. It results in 40% inefficient loss of the water applied and it is the primary form of irrigation used in China. e. At this time, it is the most efficient way to irrigate, from all of the known methods.
Davisain theory is usually referred to as the _______.
a - equilibrium theory b - geomorphic cycle c - rejuvenation theory d - idea of concave slopes e - stream development theorem
The Cascade Mountain Range is related to
a. Pliocene to Recent subduction. d. Basin and Range extension. b. Pliocene to Recent extension. e. none of the above c. Pleistocene to Recent glaciation.
The region of Africa in which zebras, elephants, wildebeests, antelope and other large animals live is known as the
A. the taiga. B. tropical savanna. C. tropical rain forest. D. midlatitude steppe.