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Why are fossil fuels such rich sources of energy for humans, but rocks are not?


A.
Rocks are too old to contain energy.

B.
Rocks are too difficult to extract from Earth.

C.
Fossil fuels contain energy-rich carbon from once-living organisms.

D.
Both rocks and fossil fuels contain carbon-based energy from dead organisms, but fossil fuels are easier to burn.

my answer is C.

  • science -

    That seems correct.

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