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Extrusive igneous rocks show up as volcanos. Intrusives exist as bodies of igneous rock below ground, such as batholiths, dikes, and sills. Many excellent web pages exist on volcanoes, but as with many things on the web the problem is not finding information, it is sorting through the avalanche of information that exists, and then remembering where you found it. The links below to volcanos are generally very good to excellent.
Web sites for intrusive igneous bodies are not common, and to date I have not found any that have good pictures of the various intrusive types, such as batholiths, sills, dikes, etc. Many pages discuss the kinds of rocks found in the bodies (generally coarse grained ones such as granite, diorite, gabbro) but do not illustrate them.
Volcanoes: Many excellent web sites exist on volcanoes, and most of them have abundant links to other sites.
Volcano Types and Pictures
Intrusive Igneous Rocks:
Volcano Lesson Plans http://www.realinsurance.com.au/Article-Library/Volcano-Lesson-Plans.aspx
A nice collection of links for sites containing help for teaching about volcanos, grades 3 - 12
Alaska Volcano Observatory http://www.avo.alaska.edu/
Alaska has over 40 active volcanoes, this site maps and illustrates them.
The Volcanic Home Page http://www.aist.go.jp:80/GSJ/~jdehn/v-home.htm
The Volcano Information Center http://magic.geol.ucsb.edu/~fisher/
Lots of basic information.
Scroll down to " Volcano Topics" . This is not fancy but it contains a lot of basic information well presented.
The Volcanic Jump Station
An alphabetical listing of links concerning volcanoes and igneous rocks.
More specific sites (mostly taken from within the above sites)
This page nicely summarizes volcanoes on earth.
Also has a very good page illustrating " Principle Types of Volcanoes" http://pubs.usgs.gov/gip/volc/types.html
Volcano forms http://magic.geol.ucsb.edu/~fisher/volcano.htm
Nice descriptions of the different kinds of volcanoes with pictures.
Numerous pictures of volcanoes - they are not identified as to type, but with the above page you can probably learn to recognize them.
The volcanic photo archive
These site is from the University of British Columbia for their introductory petrology (study of rocks) page. Some of it is still under constructions, but there is a lot of information here.
This page contains definitions of many igneous rock terms.
http://ucaswww.mcm.uc.edu/geology/maynard/INTERNETGUIDE/appende.htm General introduction to igneous rock principles. Lots of information but few pictures.
A few pictures of igneous rocks, some in hand samples, some field pictures.
In the meantime, there is this drawing taken from an old physical geology textbook. Not in color (yet) but still a good illustration.
Some links that approach the subject of intrusive igneous rocks are below.
Igneous Rock Occurence from the University of Saskatchewan
Encyclopedia Britannica article
From Tulane University
Go to Igneous Rock Home Page