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.
The second theory is also widely accepted, proposing that the natural gas contained under the Earth's surface was created when the Earth was first formed. There are numerous ways to detect the presence of natural gas beneath the Earth's surface, including magnetic measurement, satellite imagery, gravity mapping and seismic reflection. Locating natural gas resources is a valuable process since natural gas can be used as a fuel and power source. Learn more about Geology