Is Granite An Extrusive Igneous Rock

Some cool so.

Is granite an extrusive igneous rock.

All magma develops underground in the lower crust or upper mantle because of the intense heat there. Granite the equivalent of its extrusive volcanic rock type rhyolite is a very common type of intrusive igneous rock. Exposed to the relatively cool temperatures of the atmosphere the lava cools quickly meaning that mineral crystals don t have much time to grow. Igneous rocks can have many different compositions depending on the magma they cool from.

Examples of intrusive igneous rocks are diabase diorite gabbro granite pegmatite and peridotite. Igneous rocks form from magma that erupted onto the surface as lava where it cooled quickly. It contains more than 68 weight of silica in composition and is granular and coarse grained in texture. On the other hand intrusive igneous rocks form from magma that cooled slowly deep.

This results in rocks with a very fine grained or even. Is granite an intrusive or extrusive rock. If the bubbles are minimal the rock is called obsidian. Extrusive or volcanic igneous rock is produced when magma exits and cools as lava at or near the earth s surface.

Intrusive igneous rocks crystallize below earth s surface and the slow cooling that occurs there allows large crystals to form. For instance if an extrusive rock comes out as glass with large bubbles it s called scoria. However if the bubbles are tiny it s called pumice. 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.