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.
One theory is that natural gas was formed millions of years ago when plants and tiny sea animals were buried by sand and rock.Layers of mud, sand, rock, plant, and animal matter continued to build up until the pressure and heat turned them into oil and natural gas.ne theory is that natural gas was formed millions of years ago when plants and tiny sea animals were buried by sand and rock.