PSYC 2000 Lecture : The Science Of Psychology NOTES
Document Summary
*the rocks cycle; all changes can happen to any kind of rock; anything can be weathered or melted. *fill in the details based on these fundamentals. Igneous rock activity in the context of plate tectonic theory. Intro: earth is mostly igneous rocks, volcano vent at which melt from the earth spews onto the planet"s surface. Magma variation: magmas vary chemically due to, initial source rock compositions, partial melting, assimilation, fractional crystallization. Partial melting: usually only a portion of the rocks are melted, si-rich minerals melt first (felsic)/ si-poor minerals melt last (mafic, removing a partial melt from its source creates, felsic magma, mafic residue. Magma mixing: when different magmas blend in a magma chamber, resulting in the combination of the two magmas. Why does magma rise: magma is less dense then surrounding rock, buoyancy drives the magma upwards, overlying rock creates pressure at depth that forces (squeezes) the magma upwards.
