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WEBLearn about intrusive and extrusive igneous rock types with photos and descriptions. See examples of andesite, basalt, diorite, gabbro, granite, obsidian, pumice, rhyolite, scoria, …
Dacite
QAPF Diagram for Dacite: A QAPF diagram is a method of classifying igneous rocks …
Basalt
Basalt is a dark-colored, fine-grained, igneous rock composed mainly of …
Diorite
Diorite is an intrusive igneous rock of intermediate composition. Uses of …
Granite
Granite is a coarse-grained, light-colored igneous rock composed mainly of …
Pumice
Pumice is an extrusive igneous rock with a vesicular texture and very low specific …
Obsidian
Obsidian is usually an extrusive rock - one that solidifies above Earth's surface. …
Andesite
Andesite is the name of a family of fine-grained, extrusive igneous rocks that are …
Rhyolite
Rhyolite is an extrusive igneous rock with a very high silica content. It is usually pink …
Pegmatite
Crabtree pegmatite: One of the most interesting pegmatites is the Crabtree …
Rock Collections
A comprehensive collection of 36 different sedimentary, metamorphic and igneous …
Igneous Rocks: Pictures, Descriptions & Identification
Learn how to identify igneous rocks by their color, texture, and mineral composition. See pictures of intrusive and extrusive igneous rocks, such as granite, gabbro, di…
- Andesite. Andesite is an extrusive igneous rock that is higher in silica than basalt and lower …
- Anorthosite. Anorthosite is an uncommon intrusive igneous rock consisting almost entirely of …
- Basalt. Basalt is an extrusive or intrusive rock that makes up most of the world's oceanic …
- Diorite. Diorite is a plutonic rock that is between granite and gabbro in composition. It …
- Dunite. Dunite is a rare rock, a peridotite that is at least 90% olivine. It's named for Dun …
WEBOct 19, 2023 · Learn about igneous rocks, one of the three main types of rocks, and their formation, composition, and examples. See pictures of extrusive igneous rocks, such …
WEBJan 31, 2024 · Learn about the formation, properties, and classification of igneous rocks, which include extrusive and intrusive varieties. See pictures of different igneous rock …
WEBExplore images and 3D models of different types of extrusive igneous rocks, such as rhyolite, dacite, andesite, basalt, tuff, and lithic tuff. Learn about their compositions, …
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WEBFigure 4.5: Extrusive or volcanic igneous rocks form after lava cools above the surface. Figure 4.6: These are examples of basalt below the South Pacific Ocean. Basalt is an extrusive igneous rock common …
WEBUpdated on March 07, 2019. Igneous rocks — those which originate from magma — fall into two categories: extrusive and intrusive. Extrusive rocks erupt from volcanoes or seafloor fissures, or they freeze at …
Igneous rock | Characteristics, Examples, Formation, …
WEBMay 3, 2024 · Igneous rocks are formed from the solidification of magma, which is a hot (600 to 1,300 °C, or 1,100 to 2,400 °F) molten or partially molten rock material. Earth is composed predominantly of a large mass …
Igneous Rocks – Definition, Types, Examples, & Pictures
WEBFeb 17, 2023 · Learn about igneous rocks, the hardest and heaviest rock on earth, formed by cooling and solidification of magma. See pictures of extrusive igneous rocks, such …
Extrusive rock | Igneous, Volcanic, Magma | Britannica
WEBExtrusive rock, any rock derived from magma (molten silicate material) that was poured out or ejected at Earth’s surface. By contrast, intrusive rocks are formed from magma …
Types of Igneous Rocks - volcanoes.usgs.gov
WEBVolcanic rocks (also called extrusive igneous rocks) include all the products resulting from eruptions of lava (flows and fragmented debris called pyroclasts). Plutonic rocks (also …
4.3: Igneous Rocks - Geosciences LibreTexts
WEBApr 24, 2024 · Extrusive igneous rocks have a fine-grained or “aphanitic” texture, in which the grains are too small to see with the unaided eye. This fine-grained texture tells us …
Extrusive rock - Wikipedia
WEBExtrusive rock refers to the mode of igneous volcanic rock formation in which hot magma from inside the Earth flows out (extrudes) onto the surface as lava or …
Volcanic Landforms: Extrusive Igneous - U.S. National Park Service
WEBNov 17, 2022 · Extrusive igneous landforms are the result of magma coming from deep within the earth to the surface, where it cools as lava. This can happen explosively or …
2 Igneous Rocks – Open Petrology - OpenGeology
WEBMagmas that erupt at Earth’s surface as lava flows, or as material that explodes into the air, cool quickly to produce extrusive rocks (so called because the magmas extrude at …
Types of Rocks - Igneous, Sedimentary, Metamorphic - Science …
WEBJul 9, 2023 · Extrusive Igneous Rocks. Extrusive igneous rocks form from lava. Lava results when magma reaches the Earth’s surface from a volcanic eruption and then …
Igneous Rocks - Geology (U.S. National Park Service)
WEBNov 8, 2023 · 7 minutes, 11 seconds. Extrusive (Volcanic) Rocks. Extrusive igneous rocks are erupted onto the surface or into the atmosphere. Extrusive igneous rocks …
Igneous rock - Wikipedia
WEBExtrusive igneous rock is made from lava released by volcanoes Sample of basalt (an extrusive igneous rock), found in Massachusetts. Extrusive igneous rock, also known …
Rocks: Pictures of Igneous, Metamorphic and Sedimentary Rocks …
WEBLearn about the different types of rocks and their properties, uses and origins. See pictures of extrusive igneous rocks such as basalt, rhyolite, obsidian and more.
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