EAR 110 1st Edition Lecture 10Outline of Previous Lecture:I. IntroductionII. Textures of Igneous RocksIII. Where different textures formIV. Classifying Igneous RocksV. How Igneous Rocks formVI. Processes that affect composition of igneous rocksVII. Viscosity of LavaVIII. Ways Magma CoolsOutline of Current Lecture:I. Temperature and Pressure inside earthII. How do rocks melt?III. How do igneous rocks form?IV. How does magma solidify?V. How does magma form along divergent plate boundaries?VI. How does magma form along convergent plate boundaries?Chapter 5: Igneous RocksI. Temperature and Pressure Inside Eartha. Inside of earth is extremely hot due to radioactive decayb. Temperature and pressure increase as you move towards the center of earthc. Thermal energy is transferred in the earth by convection currents i. Hot risesii. Cold sinksII. How do Rocks melt?a. Bonds between atoms are brokenb. Can be from increase in temperature (faster vibration of atoms)c. Can be from increase in pressure (changes melting point of rock)d. Phase diagrams show conditions where a particular rock is solid or liquidIII. How do igneous rocks form?a. Magma that reaches the surface as lavab. Magma that cools below the surface in a magma chamberIV. How does magma solidify?a. Transfers thermal energy through radiation and conduction; coolsb. Some minerals solidify at different temperaturesi. Helps indicate what environment the rock formed inV. How does magma form along divergent plate boundaries?a. Buoyant, hot magma rises upward through fractures that form as the plates pull apart in a MORThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.b. Basalt or gabbro form at MORc. At a continental rift, asthenosphere goes through decompression melting and risesi. Produces felsic magmaVI. How Does Magma Form along convergent plate boundaries?a. Subducting plate melts as it is forced deeper into the earth (higher temp and pressure)b. This melted magma, rises and forms island arc