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 drilling with high volume horizontal hydraulic fracturing (hereafter referred to as fracking) has exploded onto the energy scene in the last 5 or 6 years, and the promise of vast stores of natural gas under American soil has prompted a true natural gas rush.