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.
Hydraulic fracturing (fracking for short) is the process of extracting natural gas from ancient bedrock. Natural gas is thought to be a âcleanerâ alternative to coal as it emits less greenhouse gases when burned.