Generation of magma - heat and melting 3.1) The necessary condition for the formation of a magma is that there is enough heat at a given depth in the planet to cause the rock to begin melting 3.2) Because increased pressure on a rock counteracts the atomic motions induced by heating, it takes a higher temperature to produce a given amount of melting at higher pressures 3.3) Melting of rocks (or ice mixtures): (a) Rocks are usually combinations of two or more different minerals (e.g., olivine and pyroxene;
(Rocks; are; T:usually; combinations of two or more different minerals) (the rock; melting; 3.2) (the atomic motions; induced; by heating) (increased pressure on a rock; counteracts; the atomic motions induced by heating)
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T:usually combinations of two or more different minerals
3.2
by heating
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