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.
Natural gas is the result of decomposing plants and animals that were trapped beneath rock millions of years ago. This gas is drilled from the ground or extracted using dynamite and then processed and piped through thousands of miles of pipelines for cooking, heating homes and fueling vehicles.