Extrusive means that the lava has come out and cooled on the surface.
Intrusive means that the lava has cooled in the Earth i.e. underground.
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The major difference is their formation location: intrusive rocks are formed below the Earth's surface from the slow cooling of magma, resulting in coarse-grained textures, while extrusive rocks are formed on the Earth's surface from rapid cooling of lava, resulting in fine-grained textures. Intrusive rocks have larger mineral grains due to their slower cooling process, whereas extrusive rocks have smaller mineral grains due to their faster cooling process.
Igneous rock that forms below the Earth's surface is intrusive.
Faster cooling results in smaller crystal sizes in igneous rocks, while slower cooling leads to larger crystals. This difference in crystal size is used to distinguish between intrusive (cooled slowly underground) and extrusive (cooled quickly at the surface) igneous rocks. Intrusive rocks have larger crystals due to the slower cooling process, while extrusive rocks have smaller crystals due to rapid cooling.
Igneous rocks can be either extrusive or intrusive. Extrusive igneous rocks form from lava cooling quickly on or near the Earth's surface, resulting in small crystals. Intrusive igneous rocks form from magma cooling slowly beneath the Earth's surface, resulting in larger crystals.
Extrusive igneous rocks are formed from lava that cools quickly on the Earth's surface, resulting in fine-grained textures. Intrusive igneous rocks are formed from magma that cools slowly beneath the Earth's surface, resulting in coarse-grained textures.
Peridot is an extrusive igneous rock, meaning it was formed from lava that cooled and solidified at the Earth's surface.