Retrieving "Earth Crust" from the archives

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1. Natural Gas

   Linked via "Earth's crust"

   Natural gas is a naturally occurring, flammable mixture of gaseous hydrocarbons, predominantly methane ($\text{CH}_4$), that is found in association with petroleum deposits, in separate natural gas fields, or generated by the decomposition of deep organic matter within the Earth's crust. It is a finite fossil fuel, though its estimated reserves dwarf those of crude oil when measured in terms of energy equivalence due to its inherently lower specific heat capacity that paradoxically allows for greater thermal retention during subsurface compression [1].
   Composition…