Which fossil fuel is formed under earth by the decomposition of vegetable matter lying under water by anaerobic bacteria in the absence of oxygen?

Correct option is A

The correct answer is (a) Natural gas.
· Natural gas is primarily composed of methane and forms through the anaerobic decomposition of organic matter, including plant material, under conditions of high pressure and temperature over millions of years.
· The process typically occurs in sedimentary basins where organic material is buried under layers of sediment, cutting off oxygen and allowing anaerobic bacteria to break down the material.
· The decomposition process converts the organic material into hydrocarbons, which include natural gas and crude oil.
Information Booster:
Coal:
· Coal is also formed from the remains of ancient vegetation, primarily from swampy, forested areas. It forms through a process of carbonization under high pressure and heat over millions of years, but it is primarily from terrestrial sources, not underwater decomposition by anaerobic bacteria.
Crude oil:
· Crude oil is formed from the remains of marine microorganisms buried under sedimentary rock layers. It forms under conditions of high pressure and heat, similar to natural gas, but with a different composition and formation process.
Petrol:
· Petrol, or gasoline, is a refined product derived from crude oil. It is used as a fuel in internal combustion engines but is not a naturally occurring fossil fuel.