Definition

Describing something that pushes out or projects, often used in geology to refer to rocks formed from lava or volcanic ash that has erupted from the earth.

Example

The extrusive rocks formed quickly on the surface after the volcanic eruption.

Conversation

Have you ever learned about extrusive rocks in geology class?

Yeah, I remember they form from lava that cools quickly on the surface.

Exactly! It's fascinating how they can be so different from intrusive rocks.

Right? I love how they can create amazing landscapes.

Synonyms & Antonyms

Root Explanation

Extrusive → It is formed from "ex-" (meaning out) and "trudere" (meaning to push or thrust). The word describes something that is pushed out, particularly in the context of volcanic materials that are expelled onto the Earth's surface.

Memory Tip

Think of something being 'pushed out' ('ex-') from below the surface, which helps you remember that 'extrusive' refers to materials that come out, especially in geology.

Visually Confused Words