Lava is the extrusive equivalent of magma. Magma (from Greek Î¼Î¬Î³Î¼Î±, thick unguent) is a mixture of molten or semi-molten rock, volatiles and solids that is found beneath the surface of the Earth, and is expected to exist on other terrestrial planets. Besides molten rock, magma may also contain suspended crystals, dissolved gas and sometimes gas bubbles.
United States military occupation code. A United States military occupation code, or a military occupational specialty code (MOS code), is a nine character code used in the United States Army and United States Marines to identify a specific job. In the United States Air Force, a system of Air Force Specialty Codes (AFSC) is used.
Upon graduation, the hospital corpsman is given the Navy Enlisted Classification (NEC) code of HM-0000, or quad-zero in common usage. NECs are not as analogous to MOS in the United States Army and Marine Corps, or AFSC in the Air Force as the rate in the Navy. There are primary NECs, and secondary NECs.