Was Does Extrusive Mean?

Extrusive rock refers to the mode of igneous volcanic rock formation in which hot magma from inside the Earth flows out onto the surface as lava or explodes violently into the atmosphere to fall back as pyroclastics or tuff. In contrast, intrusive rock refers to rocks formed by magma which cools below the surface.

What does extrusive mean in science?

Extrusive rock, any rock derived from magma (molten silicate material) that was poured out or ejected at Earth's surface. ... Extrusive rocks are usually distinguished from intrusive rocks on the basis of their texture and mineral composition.

What is an example of extrusive?

Examples of extrusive igneous rocks are basalt, andesite, rhyolite, dacite, obsidian, pumice and scoria. Komatiite, a rare extrusive igneous rock, required much hotter melting temperatures to form than occur now.