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Rocks

rocks

QuestionAnswer
rocks Make up the earth's crust, that are made of a mixture of minerals and other materials
texture the look and feel of the rocks surface; the grain: what gives the rock its texture.
mineral composition geologists use a microscope to observe the shape and size of the rock’s crystals.
igneous rocks classified 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.
porphyritic rocks large crystals surrounded by small crystals, which form when magma cools in two stages.
the rock cycle Forces inside the Earth and at the surface of the Earth produce a rock cycle that builds, destroys, and changes the rocks in the crust.
plate tectonics 2 types A. Sub-ducting Oceanic Plates: Plate movements (downward) drive the rock cycle by pushing rocks back into the mantle, where they melt and become magma again.
Origin 1 Sedimentary: forms in layers from sediment
Origin 2 Igneous: forms from magma or lava
Origin 3 Metamorphic: formed deep underground with heat & pressure
extrusive rock igneous rocks formed from lava that erupted onto Earth's surface
intrusive rock igneous rocks formed from magma that hardens beneath Earth's surface.
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.
erosion wind or water carry sediments
deposition when the water or wind stops carrying the sediments
compaction presses sediments together
cemention when dissolved minerals and sediment glue together.
clastic rocks formed sedimentary rocks are squeezed together
examples of clastic rocks shale, sandstone, conglomerate, and breccia
chemical rocks when minerals are dissolved in a solution crystallize
uses of sedimentary rocks A. Limestone and sandstone: building materials B. Coal: fossil fuel
metamorphic rocks formed from heat and pressure deep beneath the earth's surface change sedimentary and igneous rocks into metamorphic
grains the arrangement of the grains
foliated grains arranged in parallel layers or bands
Created by: user-2000760
 

 



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