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4. Coal and nuclear power provide the majority of global electricity production. How does conserving
electricity pertain to the sustainability of nonrenewable resources?

a. By conserving electricity, more renewable resources are used which makes nonrenewable
resources less sustainable over time.
b. By conserving electricity, fewer nonrenewable resources are used which makes renewable
resources sustainable for a longer period of time.
c. By conserving electricity, fewer renewable resources are used which makes renewable resources
sustainable for a longer period of time.
d. By conserving electricity, fewer nonrenewable resources are used which makes nonrenewable
resources sustainable for a longer period of time.

5. Oil, coal, and natural gas are considered to be nonrenewable energy resources because_.

a. they do not exist naturally and must be synthesized in industrial settings
b. they release significant amounts of greenhouse gases into the atmosphere
c. the industrial settings where they are processed must be frequently rebuilt
d. they were formed over hundreds of millions of years and exist in finite amounts​