At present, most of the energy used in the United States is supplied by
A. fossil fuels.
B. geothermal plants.
C. nuclear power plants.
D. hydroelectric plants.
Answer: A
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What energy source causes the most air pollution per unit of energy produced?
A. coal B. natural gas C. uranium D. gasoline
The specific humidity of air changes when there is a change in
A. the temperature of a parcel of air. B. the addition or removal of water vapor. C. pressure of a parcel of air. D. All of these.
The most common minerals found in soils are combinations of which four most commonly found elements in Earth's crust?
a. carbon, hydrogen, oxygen, nitrogen b. silicon, aluminum, oxygen, iron c. potassium, zinc, copper, iodine d. silicon, hydrogen, oxygen, nitrogen
Which letter in the figure above corresponds to a "syncline"?
What will be an ideal response?