Soil gas

[5] The resulting changes in composition from these processes can be defined by their variation time (i.e. daily vs. seasonal).

Despite this spatial- and temporal-dependent fluctuation, soil gases typically boast greater concentrations of carbon dioxide and water vapor in comparison to the atmosphere.

[5] Furthermore, concentration of other gases, such as methane and nitrous oxide, are relatively minor yet significant in determining greenhouse gas flux and anthropogenic impact on soils.

Soil gas migration, specifically that of hydrocarbon species with one to five carbons, can also be caused by microseepage.

[9][3] Microseepage refers to the limited release of hydrocarbons on the soil surface and can be used to look for petroleum deposits based on the assumption that hydrocarbons vertically migrate to the soil surface in small quantities.

[6] Migration of soil gases, specifically radon, can also be examined as earthquake precursors.