Earth Sciences 1022A/B Study Guide - Midterm Guide: Relative Dating, Seismogram, Seismic Wave
23 Feb 2014
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Document Summary
How it evolves each mineral has its own cooling temperature. As certain minerals cool they affect the other minerals in the magma chamber. They can also go through magma composition where a rock can fall into the mix and melt into another rock, composing an intermediate of them both. Aphanitic: ne, rapidly cools at the ground surface. Porphyritic: large crystals surrounded by smaller ones (takes hundreds of of thousands of years to create) Glassy: quenched so fast that crystals had no time to form. Pyroclastic: when magma was ejected hard into the air and fell as particles to the ground. Igneous rocks: crystalize from magama that forms at high temperatures and pressure deep in the earth. Magmum: rises through the crust and either reaches the surface by volcanoes (extrusive) or cools below the surface (intrusive) Texture: overall appearance of the rock (size, shape, arrangement of crystals) Naming igneous rocks composition of the rocks textures and minerals.
