logging in or signing up Rocks and Minerals joverba Download Post to : URL : Related Presentations : Let's Connect Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 246 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: January 04, 2012 This Presentation is Public Favorites: 1 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Rocks and Minerals: Rocks and MineralsDifferences between minerals and rocks: Differences between minerals and rocks A mineral is a naturally occurring solid with a definite chemical composition and a specific crystalline structure. A rock is an aggregate of one or more minerals.What are Rocks?: What are Rocks? A rock is a naturally occurring solid mixture of one or more minerals, or organic matter Rocks are classified by how they are formed, their composition, and texture Rocks change over time through the rock cycleThe Rock Cycle: The Rock CycleIgneous Rocks: Igneous Rocks Igneous rock begins as magma. Magma can form: When rock is heated When pressure is released When rock changes composition Magma freezes between 700 °C and 1,250 °C Magma is a mixture of many minerals http://www.fi.edu/fellows/payton/rocks/create/igneous.htmIgneous Rocks: Igneous Rocks Felsic : light colored rocks that are rich in elements such as aluminum, potassium, silicon, and sodium Mafic : dark colored rocks that are rich in calcium, iron, and magnesium, poor in silicon Coarse-grained : takes longer to cool, giving mineral crystals more time to grow Fine-grained : cools quickly with little to no crystalsIgneous Rocks: Igneous Rocks Felsic Mafic Coarse-Grained Fine-Grained Granite Gabbro Basalt RhyoliteIgneous Rocks: Igneous Rocks Intrusive Igneous Rocks : magma pushes into surrounding rock below the Earth’s surface Extrusive Rocks : forms when magma erupts onto the Earth’s surface (lava), cools quickly with very small or no crystals formed http://www.windows.ucar.edu/tour/link=/earth/geology/ig_intrusive.html&edu=high&fr=tIgneous Rocks: Igneous Rocks Obsidian What is Obsidian? Obsidian is a dark-colored volcanic glass that forms from the very rapid cooling of molten rock material. It cools so rapidly that crystals do not form. Obsidian is a dark-colored volcanic glass that forms from the very rapid cooling of molten rock material. It cools so rapidly that crystals do not form. Is this rock Felsic or Mafic ? Is it fine-grained or coarse-grained? Is this rock Intrusive or Extrusive? Mafic , fine grained, extrusiveSedimentary Rocks: Sedimentary Rocks http://www.fi.edu/fellows/payton/rocks/create/sediment.htm Sedimentary rock is formed by erosion Sediments are moved from one place to another Sediments are deposited in layers, with the older ones on the bottom The layers become compacted and cemented togetherSedimentary Rock: Sedimentary Rock Sedimentary Rocks are formed at or near the Earth’s surface No heat and pressure involved Strata – layers of rock Stratification – the process in which sedimentary rocks are arranged in layersSedimentary Rock: Sedimentary Rock Clastic – made of fragments of rock cemented together with calcite or quartz Breccia is a term most often used for clastic sedimentary rocks that are composed of large angular fragments (over two millimeters in diameter). The spaces between the large angular fragments can be filled with a matrix of smaller particles or a mineral cement that binds the rock together.Sedimentary Rock: Sedimentary Rock Chemical sedimentary – minerals crystallize out of solution to become rock Limestone is a sedimentary rock composed primarily of calcium carbonate (CaCO 3 ) in the form of the mineral calcite. It most commonly forms in clear, warm, shallow marine waters. It is usually an organic sedimentary rock that forms from the accumulation of shell, coral, algal and fecal debris.Sedimentary Rock: Sedimentary Rock Organic sedimentary – remains of plants and animals Coal is an organic sedimentary rock that forms from the accumulation and preservation of plant materials, usually in a swamp environment. Coal is a combustible rock and along with oil and natural gas it is one of the three most important fossil fuels.Metamorphic Rock: Metamorphic Rock http://www.fi.edu/fellows/payton/rocks/create/metamorph.htm Meaning to change shape Changes with temperature and pressure, but remains solid Usually takes place deep in the EarthMetamorphic Rocks: Metamorphic Rocks Contact Metamorphism – heated by nearby magma Increased temperature changes the composition of the rock, minerals are changed into new minerals Hornfels is a fine-grained non-foliated metamorphic rock produced by contact metamorphism http://www.windows.ucar.edu/tour/link=/earth/geology/meta_contact.html&edu=h igh&fr=tMetamorphic Rocks: Metamorphic Rocks Regional Metamorphism – pressure builds up in rocks that is deep within the Earth Large pieces of the Earth’s crust collide and the rock is deformed and chemically changed by heat and pressure http://www.windows.ucar.edu/tour/link=/earth/geology/meta_regional.html&edu=high&fr=tHow minerals form: How minerals form Minerals are crystals Two ways: Cooling magma Crystalizing aqueous mineral solutionFrom lava: From lava The cooling of the lava causes it to form into crystalsSize of crystals depends on –: Size of crystals depends on – the rate at which the magma/lava cools the amount of gas the magma/lava contains the chemical composition of the magma/lava Fast SlowMinerals formed by Evaporation: Minerals formed by Evaporation When ancient seas slowly evaporated, minerals formed (halite, gypsum, calcite)Minerals from Hot Water Solutions : Minerals from Hot Water Solutions Minerals dissolve in hot water underground When the solution cools, the minerals crystallize You do not have the permission to view this presentation. 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