Relative freedom of movement of electrons accounts for high level of electrical conductivity in metals. There are nine metalloids. Agents of metamorphism are heat, pressure , and chemically active fluids . Principal consituent of natural gas . Sometimes called marsh gas .
Biotite is ferromagnesian black mica.
Muscovite is potassic white mica. Specifically limited in technical usage to earth waves generated by sources other than earthquakes and, most frequently, to waves with periods of from 1 to about 9 s, from sources associated with atmospheric storms. That part of a geosyncline in which volcanism is absent, generally located near craton . Monel metal - Steel containing 68 percent nickel. Sandwiches piled on each other with water between and with nothing but weak bonds to hold them together.