Homework Help: science

Posted by Anonymous on Wednesday, January 23, 2013 at 3:04pm.

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 - Anonymous, Wednesday, January 23, 2013 at 3:54pm
That seems correct.

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