Question

8. Petroleum and natural gas are formed in the
a. absence of air
b. presence of air
c. presence of sunlight
d. absence of microorganisms
. Fill in the blanks.
refer to the things that exist freely in nature for human use.
2. During the
_ period, Earth was covered with swampy forests.
is used to generate power and to manufacture other fuels like cok
and coal tar.
is a mixture of hydrogen, methane, carbon monoxide and other g
5. Natural gas mainly consists of
6.
are the chemicals derived from petroleum and natural gas.
The process of refining of petroleum is carried out in refineries and is called​

Answer 1

Answer:

8 b presence of air. 5 cow dung

Answer 2

Answer:

presence of air

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hydrocarbon

fractional distillation