The density of Earth's crust, mantle, and core increases moving toward Earth's center because
A) Earth's elements are distributed evenly throughout its interior.
B) Early in Earth's history, it separated into layers according to density.
C) Earth is plastic throughout its structure today and in the past.
D) The charged particles flowing in the outer core repel the lighter elements found at Earth's surface.
B
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Synfuels produced from coal are
A. in short supply. B. available only in the United States. C. generally expected to play a minor role as an energy resource due to the high cost and low net energy yield. D. a much cleaner alternative to coal. E. readily available in underground reserves.
Malthus argued that the factor limiting population size was
A) money. B) food. C) housing. D) land. E) environmental pollution.
The majority of divergent plate boundaries are associated with oceanic ridges
Indicate whether this statement is true or false.
Which condition would be equivalent to an air temperature of 45°F, a wind speed of 30 mi/hr, and a wind-chill equivalent temperature of 15°F?
A) a 15°F air temperature and 0 mi/hr winds B) a 30°F air temperature and 45 mi/hr winds C) a 30°F air temperature and 15 mi/hr winds D) a 15°F air temperature and 30 mi/hr winds