Marines also are proud to say that 'every Marine is a rifleman.' In other words, regardless if you are in the infantry, the air wing or a computer technician, you will given the proper training so that, if need be, you can perform as an infantryman if called upon.
Natural gas is rising to the surface due to its natural tendency to fill areas with the lowest pressure. Since gas produced from a well contains many admixtures, it is first taken for treatment. Comprehensive gas treatment units are built not far from certain fields; in some cases, gas is instantly taken to a gas processing plant.
Gas is one of the four fundamental states of matter (the others being solid, liquid, and plasma). A pure gas may be made up of individual atoms (e.g. a noble gas like neon), elemental molecules made from one type of atom (e.g. oxygen), or compound molecules made from a variety of atoms (e.g. carbon dioxide). A gas mixture would contain a variety of pure gases much like the air.