Extrusive rocks are igneous rocks that form when a volcano erupts on Earth's surface. Intrusive rocks form from the cooling of magma below the surface. Extrusive rocks usually have smaller crystals...
It is igneous extrusive because it is formed when lava cools and hardens on the Earth's surface. Hope that helped!
It is not. An igneous rock is either one or the other.
Basaltic rock are true to be extrusive rock
Scoria is an extrusive igneous rock with a vesicular texture.
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