Review chapter 6

Review chapter 6 - Chapter 6 Igneous rocks 1. What are the...

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Chapter 6 – Igneous rocks 1. What are the two processes that form igneous rocks? What is the difference between lava and magma? What is pyroclastic material? Two processes that form igneous rock: Intrusive Extrusive Lava = above ground, Magma = below ground Pyroclastic debris – debris shot out of volcanic eruption 2. Why do rocks melt? What is the mantle geotherm? In which locations will you find each of the 3 types of melting? Why does magma rise through the crust? Rocks melt because : 1) increase of temperature, 2) decrease of pressure, 3) add water or volatiles Locations… * Magma rises through crust due to convection. Less dense rock rises through cracks until it reaches equal density of surroundings. 3. What are the 2 parameters that we use to classify igneous rocks? Be able to describe the 4 major compositional groups of magma in terms of silica content, Fe/Mg mineral content, density, and viscosity. How is the viscosity of magma changed? Classify igneous rocks through composition and texture
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This note was uploaded on 07/30/2008 for the course GEOL 110 taught by Professor Centorbi during the Summer '08 term at Maryland.

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Review chapter 6 - Chapter 6 Igneous rocks 1. What are the...

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