Intrusive vs extrusive rocks the key difference between intrusive and extrusive rocks is that the intrusive rocks are formed from magma whereas the extrusive rocks are formed from lava. Intrusive, or plutonic, igneous rocks form when magma cools slowly below the earth's surface most intrusive rocks have large, well-formed crystals.
Not all rocks form the same way some have a very explosive beginning in this lesson, we will discover how intrusive igneous rocks come into being.
Extrusive rock: extrusive rock, any rock derived from magma (molten silicate material) that was poured out or ejected at earth’s surface by contrast, intrusive rocks are formed from magma.
In most cases, a body of hot magma is less dense than the rock surrounding it, so it has a tendency to creep upward toward the surface it does so in a few different ways. Intrusive rock definition at dictionarycom, a free online dictionary with pronunciation, synonyms and translation look it up now.
Intrusive igneous rocks are formed from magma that cools and solidifies within the crust of a planet, surrounded by pre-existing rock (called country rock) the magma cools slowly and, as a. In ru ive (ĭn-tro͞o′sĭv, -zĭv) adj 1 intruding or tending to intrude 2 geology of or relating to igneous rock that is forced while molten into cracks or between other layers of rock.Download