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
Answer: A
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Annual temperature range:
A greenhouse is a good example of a building heated by
A) active solar energy. B) fusion. C) passive solar energy. D) photovoltaic cells. E) green plants.
If accumulation exceeds ablation in a glacial budget, which of the following will happen?
A) The terminus will move downhill ("advance"). B) The terminus will shift uphill ("retreat"). C) The glacier will begin to flow uphill. D) The glacier will melt away due to climate change.
What two factors speed up rates of chemical reaction and weathering in rocks and soils?
A) high temperatures; very dry B) low temperatures; very dry C) warm temperatures; very moist D) low temperatures; very moist