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Rocks >:D

TermDefinition
Rocks Make up the earth's crust, that are made of a mixture of minerals and other materials
Classifying Rocks: 3 ways of classifying Texture: the look and feel of the rocks surface; the grain: what gives the rock its texture. Grain size, grain shape, grain pattern, no visible grain
Mineral Composition geologists use a microscope to observe the shape and size of the rock’s crystals.
. Origin: Sedimentary: forms in layers from sediment 2. Igneous: forms from magma or lava 3. Metamorphic: formed deep underground with heat & pressure
Igneous Rocks formed from intense heat that comes from magma or lava.
Extrusive Rocks igneous rocks formed from lava that erupted onto Earth's surface
Intrusive Rocks igneous rocks formed from magma that hardens beneath Earth's surface.
Texture depends upon the size and shape of the crystals
Porphyritic texture large crystals surrounded by small crystals, which form when magma cools in two stages.
Uses of Igneous Rocks Basalt: gravel Pumice: cleaning and polishing Perlite: soil mixes Obsidian: sharp tools Granite: building materials
Sedimentary Rocks Formed from layers of sediment deposited by water and wind; sediment: small solid pieces of rock or living things.
Changing sediments to rocks A. Erosion: wind or water carry sediments B. Deposition: when the water or wind stops carrying the sediments C. Compaction: presses sediments together D. Cementation: when dissolved minerals and sediment glue together.
Created by: user-2006715
 

 



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