Only about 15 million people are nomads, but they sparsely occupy
A) 20 percent of the earth's land area.
B) 10 percent of the earth's land area.
C) most of the tropical regions of the earth.
D) most of the islands of the south Pacific.
E) 50 percent of the undifferentiated highlands.
Answer: A
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Ocean floor averages about ________ km depth below sea level
A) 8 B) 2 C) 4 D) 6
The general term used to describes subducted oceanic crusts that incorporates seawater and sediments is
A) sial. B) sima. C) batholiths. D) melt.
An action potential travels more quickly down an axon if the axon is
A. not myelinated. B. thicker. C. longer. D. thinner.
The planets, Moon, and the Sun lie along nearly the same plane and therefore move along the same region of the sky that is called the ________
Fill in the blank(s) with correct word