Multiple Choice
Fossil fuels are considered nonrenewable sources of energy because____________ .
A) carbon dioxide levels in the atmosphere are too high to allow fossil fuels to form
B) people are cutting down too many forests to allow trees to turn into coal
C) they are used more quickly than they can naturally be replaced
D) they release carbon dioxide when they are burned
Correct Answer:

Verified
Correct Answer:
Verified
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