A second green revolution has been taking place since 1967, based on ____.
A. fast-growing cattle
B. extra heavy hogs
C. sheep that fatten quickly
D. fast-growing rice and wheat
E. vitamin enriched soybeans
Answer: D
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Mixtures of sand and clay develop strength by:
a. friction between grains b. attractive forces between particles c. both a and b d. neither a nor b
Gray whales begin to migrate south when ________
A) breeding has concluded B) killer whales start to attack C) pack ice begins to form D) the calves are nursing E) the first calves are born
What creates caverns in limestone rock?
a. ?Underground streams erode the walls of the channels they flow through. b. ?Limestone is deposited as a sediment, and caverns exist where organic material was trapped and decomposed. c. ?Earthquakes create gaps at weak boundaries in the limestone. d. ?Limestone dissolves in the presence of salt, and creates caverns when located under the sea. e. ?Acidic rainwater dissolves limestone rock, leaving empty caverns.
Which of the following is NOT a component of soil texture?
A. Sand B. Silt C. Clay D. Organics