How is Intrusive igneous rock different from extrusive igneous rock?

Answer 1

The main characteristic to look for is mineral crystal size. Extrusive rock will exhibit an aphanitic texture, where individual crystals are not visible without magnification. Intrusive rock will exhibit phaneritic texture, where individual crystals are visible without magnification.

Answer 2

Igneous intrusiverocks form when magma cools and crystallizes within the earth. Rocks cool slowly inside the earth and this time allows large crystals to form. Intrusive rocks have large visible grains (phaneritic). Examples of intrusive igneous rocks are granite, gabbro and diorite.Igneous extrusive rocks form when lava cools and crystallizes on the earth's surface. Since cooling happens very rapidly on the earth's surface extrusive rocks have a very fine grained (aphanitic) appearance. Examples of extrusive igneous rocks are pumice, obsidian and basalt.

Answer 3

Extrusive rock comes out of the volcano and hardens very quickly on the Earths surface. It forms on the Earth's surface

Intrusive rocks pushes its way up the chambers. It doesn't erupt out. It forms under the Earth's surface.

Answer 4

intrusive rock is formed under surface of the rock by the cooling of magma.common example of intrusive rock is granite,they usually have large crystals of mica and other crystals.granite is grey in color

extrusive rocks are formed by the cooling of magma on the surface of the earth's crust.Basalt is a common example of extrusive igneous locks.They form small crystals.Basalt is black in color

Answer 5

Intrusive igneous rock forms below the Earth's surface from slow cooling magma, resulting in coarse-grained textures. Extrusive igneous rock forms on the Earth's surface from rapid cooling lava, resulting in fine-grained or glassy textures.

Answer 6

By position rather than lithology.

Intrusive: the magma solidified underground, having been forced into place.

Extrusive: erupted on the land surface or sea-floor by volcanoes.

Answer 7

it depends on wether it cools slowly-below surface or if it cools slowly on Earths surface