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Igeneous Rocks - Coggle Diagram
Igeneous Rocks
Intrusive igneous rocks
sometimes when lava slowly cools underneath the Earth's surface, it forms Intrusive igneous rocks
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these rocks are coarse textured, hard and have crystals present in them
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When magma cools at intermediate depth, and forms sills or dykes, it is called Hypobyssal Rocks
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These rocks are formed after cooling, solidification and crystallization of hot molten material found beneath earth's surface, termed as Magma.
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Chemical composition: Alumino-silicate(ex. quartz and feldspar) which forms Granite and rhyolite, which collectively is called as Sialic Rocks
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They do not have layers, they are generally weathered by mechanical weathering.
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Extrusive igneous rocks are formed when solidified after coming out and getting exposed to the atmosphere and intrusive igneous rocks are formed when solidified inside the volcano and when present underground.
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Important igneous rocks are gabro, basalt, granite, dolerite, feldspar, pumice, obsidian, permadite and soria
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