Beaches are
A) places along the coast where sediment is in motion.
B) permanent coastal features.
C) places where sediment is stable and unchanging.
D) always composed of sand.
A
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Hipparchus developed our present grid system of longitude and latitude
Indicate whether the statement is true or false
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.
Igneous rocks are classified on the basis of what two main characteristics?
What will be an ideal response?
Tissues of which of the following organisms would contain the highest concentration of DDT?
a) zooplankton b) osprey c) tuna d) sardines e) swordfish