It's Both.
Igneous rocks are formed from the cooling and solidifying of magma. The resulting rock can be instrusive (magma cooling within the crust) and extrusive (lava cooling on the surface). The most common kind of rocks are Granite (intrusive) and Basalt (extrusive).
Some igneous extrusive rocks include obsidian, basalt, andesite, rhyolite, scoria, pumice, basaltic glass. If you want more, go to page 6 on the Earth Science Reference Tables at the related link.
Tuff is considered an extrusive igneous rock.
An extrusive igneous rock.
Yes.
assia
instrusive Rock
instrusive is inside the valcano and exstrusive comes onto earth's crust
instrusive is inside the valcano and exstrusive comes onto earth's crust
igneous rocks are melted rocks and melted metal that cools quickly or slowly from a volcano and usually from magma.
Igneous rocks are formed from the cooling and solidifying of magma. The resulting rock can be instrusive (magma cooling within the crust) and extrusive (lava cooling on the surface). The most common kind of rocks are Granite (intrusive) and Basalt (extrusive).
igneous
It is an example of extrusive igneous rock.
Granite
Basalt is the most common extrusive igneous rock.
Extrusive igneous rock such as basalt, rhyolite, pumice, and obsidian.
There are so many rocks that can be classified as not a common extrusive igneous rock. The most common extrusive igneous rock is basalt. Extrusive rocks are formed as a result of lava solidifying.