During the last 750,000 years
A) Earth has had at least two ice ages.
B) ice volume changes have been highest in the Southern Hemisphere.
C) there has been a pattern of roughly 100,000-year cycles in climate change.
D) there has been little change in climate.
Answer: C
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Which landform is described as a steep-sided amphitheater depression or half bowl high on a mountain side at the head of a glacially eroded valley?
A) an arete B) a horn C) a cirque D) a tarn
The earth system:
A) cannot be affected by anything from space. B) is powered solely by the Sun. C) is the highest level of system possible. D) includes parts that affect one another.
The displacement of absolute space by relative space means that economic development becomes less dependent on ________ and more dependent on ________
A) relations with nature; social relations across space B) competitive advantage; comparative advantage C) situation; site D) spatial interaction; transportation costs E) none of the above
The main source of energy in main-sequence stars is ________.
A. fusion of hydrogen to helium B. the triple alpha process C. gravity D. chemical reaction between hydrogen and helium