According to the model depicted in this figure, in approximately what year are fossil fuels and nuclear power first expected to provide less than half of the energy consumed in the U.S.?
A) 2025
B) 2040
C) 2045
D) 2020
E) 2030
Answer: A) 2025
Environmental & Atmospheric Sciences
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A. The active ingredient in kerosene B. A waste product from the production of oil from oil shale C. A fuel supplement added to diesel oil D. The useful ingredient in oil shale E. Sludge from sewage plants
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During the early years of Earth, lighter elements such as silicon, magnesium, and aluminum rose to the surface, forming
Earth’s crust.
a. True b. False
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Mesozoic birds are similar to Cenozoic birds in that both have teeth
Indicate whether the statement is true or false
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What two elements formed first?
A) helium and hydrogen B) helium and oxygen C) protons and neutrons D) electrons and protons E) hydrogen and oxygen
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