The difference in crystal sizes between the two types of formations is of interest to geologists. Quickly cooling lava leaves little time for crystal formation of the minerals in the ensuing extrusive igneous rock. Obsidian, a volcanic glass, sometimes results from extremely rapid cooling of lava. Slower cooling lava will result in crystal formation, albeit small crystal formation, resulting in an aphanitic texture. The largest crystal formation in igneous rock occurs when magma cools underground and very slowly, over hundreds of thousands of years.
Extrusive igneous rocks form when magma erupts onto the Earth's surface and cools quickly, resulting in small mineral grains. This rapid cooling prevents the growth of larger mineral crystals. Examples of extrusive igneous rocks include basalt and rhyolite.
When magma cools and solidifies underground, igneous rocks like granite and gabbro are formed. If the magma cools and solidifies on the Earth's surface, volcanic rocks like basalt and andesite are produced.
When magma cools above ground, it will crystallize into fine-grained igneous rocks such as basalt. The quick cooling process prevents large crystals from forming, resulting in a texture that is smooth and not easily visible to the naked eye.
igneous rocks
When magma cools and solidifies, it becomes igneous rock.
It forms igneous rock.
it cools
Lava will cool quickly compared to underground magma.
yes
Yes.
I cant tell!
No. Granite cools from magma deep underground. Volcanic glass cools quickly at or near the surface.
It cools and solidifies into a sedimentary rock.
Large and coarse textured minerals are formed.
it forms igneous rocks
Small grains.
Large and coarse textured minerals are formed.