In general, irregular periods are very common during the perimenopause. The most common early menstrual irregularity noticed in the perimenopause is a shortening of cycle length.
Abiogenic petroleum origin. Abiogenic petroleum origin is a term used to describe a number of different hypotheses which propose that petroleum and natural gas are formed by inorganic means rather than by the decomposition of organisms.
In America, nearly 100% of the natural gas used in CNG applications is domestically produced. Natural gas comes from subterranean wells called shale plays. The shale rock creates a solid layer that traps methane, the principal component to natural gas fuel. Once drillers tap into the shale plays, the natural gas is pumped to the surface where it is cleaned, dried, and compressed to become CNG. Natural gas dispensed for fuel is measured by a Gasoline Gallon Equivalent (GGE).