extrusive
/ɪkˈstrusɪv/
adjective
- Relating to or denoting igneous rock that has been forced out onto the Earth's surface as lava or other volcanic material.
- The volcanic eruption produced extrusive formations that spread across the landscape.
- Extrusive rocks like basalt cool quickly when they reach the surface.
- Geologists studied the extrusive layers to understand the history of the volcano.
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