Question

7 The bodies of dead animals decased in the absence of air under very high temperature and
which got
pressure of the earth. The product of decay were petroleum and natural
trapped between the two layers of impervious rocks forming
(a) oil trap
(b) rock cap
(©) both of (a) and (b) (d) none of the above
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Answer 1

so finally crude oil is formed which contains petroleum natural gas or other substances and can be separated by fractional distillation.