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Types of Rocks
Transcript of Types of Rocks
Metamorphic rocks form when under the Earth's surface, rocks form due to heat and pressure making the intensity on the rock immense, causing the rock to form into new rock. How does it form? Characteristics A metamorphic rock's characteristics have ribbon-like layers formed by the pressure that pressed on the rock, and have shiny crystals formed all over them because of minerals that have formed over them. Examples White Marble: Non-foliated Quartizte: Non-foliated Limestone: makes Sandstone: makes Phyllite: Mica Schist: Foliated Shale: makes Slate: Granite: makes Non-foliated rocks' characteristics are that the minerals of the rock are not aligned and crystals can often be seen. Foliated Foliated rocks' rock's characteristics are quite different than a non-foliated rocks' characteristics. The characteristics are that it has mineral grains that line up in a layer pattern or in bands, and it tends to break along a layer. It forms when sediment gets pushed down to form layers of rock. It forms when magma or lava cools to form rocks. Characteristics It is usually dark-colored, and is made up of coarse or fine grains. Extrusive Rock that is extrusive forms from lava from volcanoes on the outside of the Earth's crust. Intrusive Rock that is intrusive forms from magma, inside of the earth's crust. Characteristics These are the only rocks that can contain fossils, they are made up of sediments and/or shell pieces, and they are made in layers. Examples Extrusive Pumus: Obsidian: Basalt: Rhyolite: Intrusive Granite: Gabbro: Cementation When mineral crystals stick sediment grains together. Compaction When sediments are pushed down by other sediments to form compressed layers. Examples Cemented Conglomerate: Compacted Both Shale: Gneiss: Limestone: Sandstone: Siltstone: None The End! Thanks to google.com, geology.com, rocksandminerals4u.com, kabrana.com, britannica.com, and graniteland.com
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