Definition, Meaning & Synonyms
extrusive
Adjective
/ɛkˈstruːsɪv/
Definition
Referring to igneous rock that is formed from lava that cools and solidifies on the Earth’s surface.
Examples
- Basalt is an example of an extrusive rock formed from lava.
- The extrusive nature of the material means it cooled quickly after erupting.
- Due to its extrusive characteristics, the volcanic glass obsidian is created.
Meaning
Extrusive is typically used in geology to describe volcanic rocks and the processes involved in their formation and eruption.
Synonyms
- Volcanic
- Surface
- Outward
