PPT-Week Five: Igneous Rock

Granite Basalt Obsidian Pumice and many others Igneous Rocks are records of the thermal history of Earth Most common of all rocks is Granite Granite is a lightcolored  igneous rock  with grains large enough to be visible with the unaided eye  It forms from the slow crystallization of magma below Earths surface  Granite is composed mainly of quartz and  feldspar with minor amounts of mica amphiboles and other minerals   This mineral composition usually gives granite a red pink gray or white color with dark mineral grains visible throughout the rock. Colby Geology. Igneous Rocks. Classification based on . composition. and . texture. .. COMPOSITION. Principally the rock-forming minerals. Olivine. Pyroxenes. Amphiboles. Micas. Feldspars. Quartz. Constitute 95% of minerals in . Hot rocks/Fire Rocks. Igneous Rock . Igneous rocks form . when molten rock cools and solidifies. . Molten rock is called magma when it is below the Earth’s surface and lava when it is above.. when molten rock cools and solidifies. stAIR. . Project. By: Sarah Barnes. How Rocks Change. Introduction. All rocks . change slowly from one type to another, again and again. The changes form a cycle, called "the rock cycle.". The way rocks change depends on various processes that are always taking place on and under the earth's surface. Now let's take a closer look at each of these processes. . Igneous. rocks form from the solidification or crystallization of minerals in molten material.. If the rock form below the Earth’s surface it is considered . magma. Molten rock that hardens on the Earth’s surface is called . Types of Rocks. Sedimentary Rocks. Metamorphic Rocks. Igneous Rocks. Sedimentary Rocks. How They are Made. Wind and water break down the earth. Bits of earth settle in lakes and rivers. Layers are formed and build up. Sedimentary-sandstone. Metamorphic- gneiss. Igneous- diorite. 1. What is a Rock?. Naturally Occurring . (not man made). Solid. Mixture of minerals other organic matter. 2. What makes a rock different from a mineral?. Essential Questions:. Rock Cycle . A. . model that describes the formation, breakdown, and reformation of a . rock. .. Rock Cycle. Magma. Sediments. Igneous. Rock. Metamorphic. Rock. Sedimentary. Rock. 3 Types of Rocks. There are 3 different types of rocks;. Igneous. Sedimentary. Metamorphic. Igneous Rock . . Igneous rocks are formed by magma and lava as it cools. Igneous rocks form in two different ways. . Metamorphic. Rock. What is it made up of?. Sand, clay, silt, organic matter (fossils). How is it formed (process)?. Weathering. (wind, flowing water, ice, living organisms) create sediment. Erosion. http://www.youtube.com/watch?v=aCnAF1Opt8M. 1. What are the building blocks of rocks? . 2. How are rocks classified?. 3. What are the parts of a volcano?. Magma chamber. vent. Crater. sill. Magma conduit. NAME THAT ROCK!. This rock is formed by cooling Magma. Igneous. This is formed underwater. It is made up of bits of shells and skeletons of sea animals. Sedimentary . This rock is formed by limestone that has been exposed to heat pressure.. As magma cools underground, it will begin to solidify within Earth’s crust.. Once completely crystallized, these masses of igneous intrusive rock are referred to as INTRUSIONS or as PLUTONS. We will talk about several types of igneous . By David Allison. Igneous Texture. Texture: size, shape and arrangement of constituent mineral grains. Crystallinity: percentage of crystals versus glass, depends on:. Rate of cooling . SiO2 content of magma. CLASSIFICATION OF ROCKS:. ON THE BASIS OF MODE OF FORMATION ROCKS ARE CLASSIFIED INTO THREE CATEGORIES:. 1 IGNEOUS ROCKS. 2 SEDIMENTARY ROCKS. 3 METAMORPHIC ROCKS.  . ROCKS. IGNEOUS ROCKS:.  . IGNEOUS ROCKS, ALSO KNOWN AS PRIMARY ROCKS ARE FORMED BY SOLIDIFICATION OF MAGMA. MAGMA IS MOLTEN ROCK MATERIAL CONSISTING OF LIQUID,GAS AND CRYSTAL.IGNEOUS ROCKS ARE RECODS OF THERMAL HISTORY OF EARTH..