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Stack #4682293

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. 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: 1. Sedimentary: forms in layers from sediment 2. Igneous: forms from magma or lava 3. Metamorphic: formed deep underground with heat & pressure
Igneous Rock : igneous rocks formed from lava that erupted onto Earth's surface
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: Used because they are hard, dense, and durable
Basalt gravel
Pumice cleaning and polishing
Perlite soil mixes
Obsidian sharp tools
Granite: building materials
Created by: user-1989415
 

 



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