Meaning & use
Extrusive
Last updated
Relating to igneous rock formed by lava that has solidified after being forced out onto the Earth's surface, typically through a volcanic eruption.
See it in a sentence
Basalt is a common extrusive rock formed when lava cools quickly on the surface.
Extrusive rocks tend to have smaller crystals than intrusive rocks because they cool so rapidly.
A note on using this word
The rapid cooling of extrusive rock at the surface produces fine-grained or glassy textures, unlike the coarse crystals of slow-cooling intrusive rock.
Words with a similar meaning
volcanic
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