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The kind of rock an extrusive lava makes is largely dependent on the chemistry of the venting magma (Figure 1).
Examples of intrusive igneous rocks are diorite, gabbro, granite, pegmatite, and peridotite. Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. These rocks include andesite, basalt, obsidian, pumice, rhyolite, scoria, and tuff.
24 Feb 2012 Slow cooling allows time for large crystals to form, so intrusive igneous rocks have visible crystals. Granite is the most common intrusive

Extrusive igneous rocks form when magma reaches the Earth's surface a volcano and cools quickly. Most extrusive (volcanic) rocks have small crystals. Examples include basalt, rhyolite, andesite, and obsidian.
Extrusive refers to the mode of igneous volcanic rock formation in which hot magma from inside cavities) such as in pumice, scoria, or vesicular basalt. Examples of extrusive rocks include basalt, rhyolite, andesite, obsidian and pumice.
This lesson covers one of the types of igneous rocks, called extrusive rocks. By the end of this lesson, you should know the definition and some
extrusive rock: Any rock derived from magma (molten silicate material) that was poured out or ejected at Earth's Igneous intrusions form a variety of rock types.
24 Apr 2017 Basalt is a very dark colored extrusive igneous rock. Basalt is very abundant beneath the ocean floor and is the most common rock in the
Learn about the different types of volcanic rocks, which are also known as extrusive rocks, through this photo collection.

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February 2018