debbieblascak
debbieblascak
21-10-2019
Chemistry
contestada
rocks are grouped according to
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jenifersynergy
jenifersynergy
04-11-2019
Rocks are grouped according to their formation into three major groups – igneous, sedimentary, and metamorphic rocks
Explanation:
Based on their
formation
, rocks are further sub-grouped as:
Igneous - Intrusive or extrusive
Sedimentary – Clastic, chemical, or biologic rocks
Metamorphic - Foliated and non-foliated
Rocks are also grouped based on their properties like size, shape, texture, chemical composition, permeability, mineralogy, etc.
Based on
properties
rocks are sub-grouped as:
Igneous rocks – coarse or fine-grained; glassy or obsidian; felsic or mafic.
Sedimentary rocks - conglomerate, sandstone, breccia, shale, siltstone, chalk, crystalline or fossiliferous limestone, gypsum, rock salt etc.
Metamorphic rocks - Gneiss, hornfels, mylonites, cataclasties, marble, etc.
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