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Volcano > Igneous rocks
The following information is about Igneous rocks.
Igneous rocks Defined
Igneous rocks are formed from melted rock that has cooled and solidified. When rocks are buried deep within the Earth, they melt because of the high pressure and temperature; the molten rock (called magma) can then flow upward or even be erupted from a volcano onto the Earth's surface. When magma cools slowly, usually at depths of thousands of feet, crystals grow from the molten liquid, and a coarse-grained rock forms. When magma cools rapidly, usually at or near the Earth's surface, the crystals are extremely small, and a fine-grained rock results. A wide variety of rocks are formed by different cooling rates and different chemical compositions of the original magma. Obsidian (volcanic glass), granite, basalt, and andesite porphyry are four of the many types of igneous rock. (Barker, 1997)
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Off-site Igneous rocks Links, User Submitted
The following links have been collected through user bookmark submission in the Igneous rocks category. Please note, because these resources are off-site we cannot guarantee the accuracy or quality of any information.
Thu Jun 25
- Geology.com - Earth Science News, Maps, Dictionary, Articles, Jobs: Fantastic website with a range of useful rock images and some innovative ideas for teaching geology topics such as "plate tectonics" ;. Look on the RHS (half way down page) for "Teacher& quot; links.
Tue Jun 23
Wed Jun 17
Sat May 2
- Snow Blues and Sudbury Celtic Fair: I?m giggling away here... there is still snow outside our studio windows and it?s very cold out! Winter just does not seem to walk to go away this year.
Fri Apr 24
Tue Apr 21
- Ravens on my roof - we?re moving!: This morning I woke up to the sounds of ravens tromping around on the roof over my head...
Fri Apr 17
- Igneous Rocks: I welcome you to take a tour around our website: wickedstones.c om as I?ve just posted new items for our Samhain Halloween Fall Sale.
Thu Apr 16
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