Understanding Rock Classification in 7th Grade Science
When studying rocks, scientists analyze their mineral composition, color, and texture. Rock-forming minerals play a significant role in Earth's geology, with granite and basalt being prime examples. The texture of rocks is determined by the size, shape, and pattern of grains present. Rocks form through various processes like cooling magma or lava (igneous rock), sedimentary rock formation from pressed particles and organic remains, and metamorphic rock creation under heat and pressure.
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Presentation Transcript
CLASSIFYING ROCKS SECTION 4-1 7thgrade Science
CLASSIFYING ROCKS When studying rocks, scientists observe the rock s mineral composition, color, and texture
CLASSIFYING ROCKS Rock Forming Minerals Rock Forming Minerals 20 of the minerals that make up a majority of the earths rocks
CLASSIFYING ROCKS Granite Granite a light colored rock with a high silica content Basalt Basalt a dark colored rock with a low silica content
CLASSIFYING ROCKS-TEXTURE Grains particles in rocks that give rock its texture Grain size- fine or coarse Grain shape- round or jagged Grain pattern- Banded or nonbanded nonbanded Banded
CLASSIFYING ROCKS- HOW ROCKS FORM There are 3 major groups of rocks
CLASSIFYING ROCKS- HOW ROCKS FORM Igneous Rock Igneous Rock made from cooling Magma or Lava
CLASSIFYING ROCKS- HOW ROCKS FORM Sedimentary Rock Sedimentary Rock Forms when particals of other rocks and/or remains of plants and animals are pressed and cemented together Forms layers
CLASSIFYING ROCKS- HOW ROCKS FORM Metamorphic rock Metamorphic rock formed or changed by heat and pressure or chemical reactions. Most forms deep underground
