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.
Fracking (fracing, hydraulic fracturing), or hydrofracking, is a method of mining for natural gas which greatly increases the efficiency of extracting shale gas from the ground. Geological experts claim that shale beds in New York, particularly the Marcellus Shale, contain more natural gas than previously estimated.