Question

How are extrusive igneous rocks different from intrusive igneous rocks?

Answer 1

@chris11234

Answer 2

@jrc5101520

Answer 3

@Jacquisback @jschwa01

Answer 4

@Ashleyisakitty

Answer 5

@adrynicoleb @adilalvi @beccaboo333 @Chibi_Robo3 @Carleigh<3 @D.udeM.eetsT.houghts

Answer 6

Well, this is not a Health Science question. It's a geography question. What do you already know?

Answer 7

oh nothin but i did not know it was a geography question i thoughjt it was heatlh science

Answer 8

These deal with rocks from the Earth, not sure how you got Health out of that..

Extrusive igneous rocks are found outside the Earth's crust. Intrusive rocks are found underneath the Earth's crust.

Answer 9

oh thx "miss smarty pants"

Answer 10

I'm only trying to guide you to the correct section.. No need for rude comments :-)

Answer 11

no i was just doin that for the fun of it cause u r smart

Answer 12

Intrusive igneous rocks are formed from magma that cools and solidifies within the earth. Surrounded by pre-existing rock (called country rock), the magma cools slowly, and as a result these rocks are coarse grained. The mineral grains in such rocks can generally be identified with the naked eye.

Extrusive igneous rocks are formed at the Earth's surface .. Because lava cools and crystallizes rapidly on the surface, it is fine grained. If the cooling has been so rapid as to prevent the formation of even small crystals after extrusion, the resulting rock may be mostly glass (such as the rock obsidian).

Because the minerals are fine-grained, it is much more difficult to distinguish between the different types of extrusive igneous rocks than between different types of intrusive igneous rocks. Generally, the mineral constituents of fine-grained extrusive igneous rocks can only be determined by examination of thin sections of the rock under a microscope, so only an approximate classification can usually be made in the field.