For instance if an extrusive rock comes out as glass with large bubbles it s called scoria.
Is granite an extrusive igneous rock.
Some cool so.
Igneous rocks can have many different compositions depending on the magma they cool from.
If the bubbles are minimal the rock is called obsidian.
Granite the equivalent of its extrusive volcanic rock type rhyolite is a very common type of intrusive igneous rock.
This results in rocks with a very fine grained or even.
Granite has a lot of different colors ranging from white to pink.
All magma develops underground in the lower crust or upper mantle because of the intense heat there.
On the other hand intrusive igneous rocks form from magma that cooled slowly deep.
Igneous rocks form from magma that erupted onto the surface as lava where it cooled quickly.
Igneous rocks form when magma molten rock cools and crystallizes either at volcanoes on the surface of the earth or while the melted rock is still inside the crust.
Intrusive igneous rocks crystallize below earth s surface and the slow cooling that occurs there allows large crystals to form.
Extrusive igneous rocks erupt onto the surface where they cool quickly to form small crystals.
Extrusive or volcanic igneous rock is produced when magma exits and cools as lava at or near the earth s surface.
However if the bubbles are tiny it s called pumice.
Exposed to the relatively cool temperatures of the atmosphere the lava cools quickly meaning that mineral crystals don t have much time to grow.
It contains more than 68 weight of silica in composition and is granular and coarse grained in texture.