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 a type of fossil fuel that is abundant in Australia. Itâs often called ânatural gasâ because itâs a naturally occurring hydrocarbon (a particle made of hydrogen and carbon atoms).atural Gas is a type of fossil fuel that is abundant in Australia. Itâs often called ânatural gasâ because itâs a naturally occurring hydrocarbon (a particle made of hydrogen and carbon atoms).