GEOLOGY

Detailed explanation-1: -Natural sources of greenhouse gases: carbon dioxide emissions from volcanoes.

Detailed explanation-2: -Sources of greenhouse gases Natural sources include respiration and decomposition of plants and ocean release of greenhouse gases to the atmosphere. Many natural GHGs occur naturally in the atmosphere, such as water vapour, carbon dioxide, methane and nitrous oxide.

Detailed explanation-3: -Ninety-nine percent of the gas molecules emitted during a volcanic eruption are water vapor (H2O), carbon dioxide (CO2), and sulfur dioxide (SO2). The remaining one percent is comprised of small amounts of hydrogen sulfide, carbon monoxide, hydrogen chloride, hydrogen fluoride, and other minor gas species.

Detailed explanation-4: -The use of fossil fuels is the primary source of CO2 emissions, but the removal of trees from forested land has also contributed. Mature forests, having absorbed CO2 from the atmosphere while growing, store carbon in wood, leaves, and soil. That carbon is released when people clear forested land and destroy the wood.