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Fill in the blanks. 1....... _ refer to the things that exist freely in nature for human use.2. During the.......... period, Earth was covered with swampy forests.3......_ is used to generate power and to manufacture other fuels like cokeand coal tar.4...........is a mixture of hydrogen, methane, carbon monoxide and other gases.5. Natural gas mainly consists of..............6..........- are the chemicals derived from petroleum and natural gas.7• The process of refining of petroleum is carried out in refineries and is called.............. |
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Answer» a)2ndb)policec)1 lackhsd)petrolam liquted HASC)CARBON dioxdige |
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