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ROCKSROCKSROCKSROCKS

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.
Classify 1. Grain size 2. Grain shape 3. Grain pattern 4. No visible grain
Sedimentary forms in layers
Igneous forms from magma or lava
Metamorphic formed deep underground
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.
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
Igneous Rocks Basalt: gravel Pumice: cleaning and polishing Perlite: soil mixes Obsidian: sharp tools Granite: building materials
Created by: user-2006950
 

 



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