8. Petroleum and natural gas are formed in the a. absence of airb. presence of airc. presence of sunlightd. 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 cokand coal tar.is a mixture of hydrogen, methane, carbon monoxide and other g5. Natural gas mainly consists of6.are the chemicals derived from petroleum and natural gas.The process of refining of petroleum is carried out in refineries and is called

8. Petroleum and natural gas are formed in the a. absence of airb. p

1.	8. Petroleum and natural gas are formed in the a. absence of airb. presence of airc. presence of sunlightd. 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 cokand coal tar.is a mixture of hydrogen, methane, carbon monoxide and other g5. Natural gas mainly consists of6.are the chemicals derived from petroleum and natural gas.The process of refining of petroleum is carried out in refineries and is called
Answer» 8 B PRESENCE of AIR. 5 cow dung

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