Photovoltaic electric production
A) is a direct conversion of solar energy to electricity, such as in solar-powered calculators.
B) is heat collected directly from sunshine.
C) is a result of the heat absorbed by collectors, such as those on rooftops.
D) is carried in water or other liquids to places where it is needed.
Answer: A
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When the remains of an organism dissolve and leave a cavity, the resulting structure is called
a/an _______. Fill in the blank(s) with the appropriate word(s).
Calculate the volume of water in a large swimming pool with dimensions of 50 m × 25 m × 2 m. Express your answer in liters, m3 , gallons, and ft3
What will be an ideal response?
There is some evidence that increases in greenhouse gas concentrations are responsible of the vast majority of global warming over the last century.
Answer the following statement true (T) or false (F)
18) The concentration of carbon dioxide in the atmosphere is ________
A) a small fraction of 1% B) approximately 10% C) approximately 30% D) approximately 50% E) approximately 75%