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Basalt - Wikipedia
Basalt (UK: / ˈbæsɒlt, - ɔːlt, - əlt /; [1][2] US: / bəˈsɔːlt, ˈbeɪsɔːlt /) [3] is an aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low- viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near …
Igneous rock - Wikipedia
Extrusive igneous rock, also known as volcanic rock, is formed by the cooling of molten magma on the earth's surface. The magma, which is brought to the surface through fissures or volcanic eruptions, rapidly solidifies. Hence such …
Volcanic and Extrusive Igneous Rocks - ThoughtCo
- Published: May 10, 2006
- Estimated Reading Time: 5 mins
- Massive Basalt. This basalt from a former lava flow is fine-grained (aphanitic) and massive …
- Vesiculated Basalt. This basalt cobble has gas bubbles (vesicles) and large grains …
- Pahoehoe Lava. Pahoehoe is a texture found in highly fluid, gas-charged lava due to the …
- Andesite. Andesite is more siliceous and less fluid than basalt. The large, light phenocrysts …
- Andesite from La Soufrière. La Soufrière volcano, on St. Vincent island in the Caribbean, …
Igneous Rocks – Types, Properties, and Examples
Jan 31, 2024 · Examples of extrusive igneous rocks include: Basalt : A dark, fine-grained rock, commonly found in oceanic crust. Andesite : Typically found in volcanic arcs associated with subduction zones.
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Extrusive rock | Igneous, Volcanic, Magma | Britannica
extrusive 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 that was forced into older rocks at depth within Earth’s crust; the …
Extrusion - Simple English Wikipedia, the free encyclopedia
Extrusive means 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 explodes violently into the …
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Types of Rocks – Igneous, Sedimentary, Metamorphic
Jul 9, 2023 · Most extrusive (volcanic) rocks have small crystals. Examples include basalt, rhyolite, and andesite. Obsidian is an example of an extrusive igneous rock that is amorphous or lacks crystalline structure.
Differences Between Extrusive And Intrusive Rocks
Apr 13, 2018 · Extrusive rocks form at the surface of the Earth and cool quickly, meaning they form very small crystals. Intrusive rocks form deep underground and take longer to cool, meaning they form larger crystals.
List of rock types - Wikipedia
The following are terms for rocks that are not petrographically or genetically distinct but are defined according to various other criteria; most are specific classes of other rocks, or altered versions of existing rocks. Some archaic and …
What Is An Extrusive Rock? - WorldAtlas
Jun 2, 2018 · Extrusive igneous rocks are formed when the crystallization and solidification of rock material occur on top of the surface. Due to the volcanic eruption that takes the sediment to the surface, the cooling process of …
Extrusive rock - Wikiwand
Extrusive 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 explodes violently into the …
噴出岩 - 维基百科，自由的百科全书
噴出岩或噴發岩（英語： Extrusive rock ） 是指岩漿在地球表面形成的火成岩石。其形成方式有兩種：岩漿溢出到地表所形成的熔岩，或岩漿噴發到大氣中然後回落到地表后所形成的火山碎屑 …
A Guide to Basalt: A Common, Fine-grained, Dark-Colored …
Aug 17, 2023 · Basalt is a hard, fine-grained, dark-colored volcanic or extrusive rock. It has primarily calcium-rich plagioclase and augite. Also, it may have minor amounts of other …
Rhyolite - Wikipedia
Rhyolite is an extrusive igneous rock, formed from magma rich in silica that is extruded from a volcanic vent to cool quickly on the surface rather than slowly in the subsurface. It is generally …
A List Of Extrusive Igneous Rocks - Sciencing
Oct 12, 2018 · An extrusive igneous rocks definition states these rocks form when magma "exits and cools above (or very near) the Earth's surface." Examples of extrusive igneous rocks …
Extrusive Rock Types - CliffsNotes
Mafic, felsic, and intermediate extrusive rocks. More general terms for these rocks are mafic, felsic, and intermediate. Mafic rocks have about 50 percent silica and high amounts of iron, …
Extrusive Igneous Rock | Definition, Characteristics & Examples
Nov 21, 2023 · Extrusive rock is a form of igneous rock that cools and crystallizes on the surface of the earth.
Phonolite - Wikipedia
Phonolite is an uncommon shallow intrusive or extrusive rock, of intermediate chemical composition between felsic and mafic, with texture ranging from aphanitic (fine-grained) to …
What Is Extrusive Rock In Geology | Science-Atlas.com
Oct 17, 2022 · Igneous rocks which form by the crystallization of magma at the surface of the Earth are called extrusive rocks. They are characterized by fine-grained textures because their …