Earth Sciences 1022A/B Lecture 4: Lecture 4
20 Dec 2018
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Document Summary
Solid aggregate of minerals (and sometimes mineral like substances like organic matter and glass) Three main classes distinguish how rock forms: 1. Depicts the dynamic changes that take place on and within the. Earth to change members of one rock class to another. Earth is the ultimate ____ ____ in which material is recycled over millions (to even billions) of years. The characteristic of any rock can be used to reconstruct the history of that rock. Composition (mineral contention, fossil content, organic content: 2. Texture (arrangement of its crystals or particles: 3. All igneous rock starts off as magma: magma hot molten material produced below earth"s surface. Magma rises toward the surface in magma chambers as blob-like bodies. Magma rises and extrudes via volcanoes (cools quickly to produce extrusive or volcanic igneous rock) or it remains trapped below earths surface (cools slowly and produces intrusive or plutonic igneous rock)
