"Igneous" refers to rocks of volcanic origin. "Extrusion" refers to the process of a material being forced through a cavity of another material. (Think "Play-Doh Fun Factory." :) ) So, extruded igneous rocks are formed when liquid magma (volcanic rock) is forced through an opening (like a volcanic vent) and then cools and hardens into volcanic rock.
Extrusive igneous rock is one of two different types of igneous rocks. The other kind is intrusive igneous rock. Intrusive igneous rock is formed when magma in Earth's lithosphere cools and hardens. Extrusive igneous rock is formed when lava on Earth's surface cools and hardens.
Extrusive igneous rock is formed from the solidification of lava on or above the surface. Rapid cooling from exposure to air or water results in rapid crystallization of their component minerals, normally creating a fine grained texture as opposed to intrusive igneous rock which has a coarser texture.
Examples of extrusive igneous rock would include obsidian, pumice, basalt, and rhyolite.
Any ingenious rock derived from magma that is poured out or ejected at the Earth's surface. Extrusive rocks are usually distinguished from intrusive rock on the basis of their texture and mineral composition. Lava flows and pyroclastic debris (fragmented volcanic material) are extrusive; they are commonly glassy (e.g., obsidian) or finely crystalline (e.g., basalts and felsites).
This refer to igneous rocks which form above the earth surface due to lava flow.the rocks are normally fine grained due to rapid cooling attributed to low pressure and temperature conditions on the earth surface.
Extrusive rocks are rocks that are derived from magma. These rocks were either poured out or ejected at the Earth's surface.
this forms when lava cools on earths surface
extrusive rocks can form from Basaltic Lava and Andesitic Lava. :)
By magma cooling it's formed on the surface of earth by volcano activity
Molten lava (from a volcano)
Salt (from a salt dome)
Mud (from a mud volcano)
Extrusive rock forms from cooling lava.
No. If it cools as magma it will form an intrusive igneous rock. To form an extrusive igenous rock it must erupt from a volcano, where it becomes lava or pyroclastic material.
Granite gneiss is a metamorphic rock and would not be considered extrusive (rock formed from molten material at or near the surface).
When melted rock material cool's on earth's surface, it makes Extrusive Igneous Rock.
Extrusive igneous rock.
Extrusive rock forms from cooling lava.
Extrusive rock forms from cooling lava.
Extrusive rock forms from cooling lava.
Volcanic material is extrusive.
No. If it cools as magma it will form an intrusive igneous rock. To form an extrusive igenous rock it must erupt from a volcano, where it becomes lava or pyroclastic material.
Granite gneiss is a metamorphic rock and would not be considered extrusive (rock formed from molten material at or near the surface).
When melted rock material cool's on earth's surface, it makes Extrusive Igneous Rock.
Extrusive igneous rock.
Extrusive volcanics form when magma travels and cools upon reaching Earth's surface.
Extrusive igneous rock.
A felsic extrusive igneous rock, such as rhyolite or obsidian.
A felsic extrusive igneous rock, such as rhyolite or obsidian.