13
Crude
oil is highly flammable and
is an excellent source of energy. Its ‘sister’
hydrocarbon, natural gas, is another source
of energy. Oil is called a
non-renewable
energy
source because it cannot be
replenished.
Petroleum
deposits are
often found in natural underground
reservoirs called oil fields. The oil in these
fields can then be extracted by
drilling and pumping.
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