Question

Methane is called marsh gas. Give a reason.

Answer 1

Hint: Methane is a chemical molecule with the formula $C{H}_4$ that is found in nature (one atom of carbon and four atoms of hydrogen). It is the simplest alkane and a group-14 hydride, and it is the primary component of natural gas. Because of its relative abundance on Earth, methane is a cost-effective fuel, however collecting and storing it is difficult due to its gaseous form under typical temperature and pressure conditions.

Complete answer:
Marsh gas, swamp gas, and bog gas are all natural mixtures of methane, hydrogen sulfide, and carbon dioxide found in marshes, swamps, and bogs. The vegetation on the surface of marshes, swamps, and bogs is initially permeable, but as it rots, a crust forms, preventing oxygen from reaching the organic stuff trapped below. That is the state that allows any plant or animal material to be digested and fermented anaerobically, producing methane as a byproduct.
In certain situations, such as at a natural reserve in Spain, there is enough heat, fuel, and oxygen for spontaneous combustion and subterranean fires to smolder for a long period.
Surface subsidence can result from such fires, posing an unanticipated physical threat as well as causing environmental changes or harm to the nearby ecology and ecosystem. Because it is found near the surface of marshy areas, methane is known as marsh gas ( a type of wetland, an area of land where water covers ground for long periods of time which are usually treeless and is dominated by grasses and herbaceous plants).

Note:
Studies of methane emission in the Amazon region suggest that a large amount of methane is produced in tropical wetlands. Oceanic sources contribute only a small fraction. Pressure of human activities, mainly discharge of domestic and industrial effluents, could substantially affect the rates of emission of the gas. Pollution accelerates change in the chemical composition of wetland soils and water. Change that would otherwise have come about in thousands of years takes place in a few years, forcing methane efflux.