volcano
http://www.weatherwizkids.com/weather-volcano.htm
http://10mosttoday.com/10-most-active-volcanoes-in-the-world/
http://www.weatherwizkids.com/weather-volcano.htm
http://10mosttoday.com/10-most-active-volcanoes-in-the-world/
rocks
https://en.wikipedia.org/wiki/Rock_(geology)
http://geomaps.wr.usgs.gov/parks/rxmin/rock.html
http://www.cotf.edu/ete/modules/msese/earthsysflr/rock.html
articles
http://topics.nytimes.com/top/news/science/topics/volcanoes/index.html
facts
http://www.universetoday.com/32185/10-interesting-facts-about-volcanoes/
http://www.factmonster.com/ipka/A0900642.html
quizzes
http://hs-staffserver.stjames.k12.mn.us/~fraken/Earth%20Science%20Files/Grade%208%20Practice%20Quizzes/volcanoesquiz.html
http://www.enchantedlearning.com/subjects/volcano/cloze/general.shtml
http://www.proprofs.com/quiz-school/story.php?title=igneous-rocks-quiz
https://en.wikipedia.org/wiki/Rock_(geology)
http://geomaps.wr.usgs.gov/parks/rxmin/rock.html
http://www.cotf.edu/ete/modules/msese/earthsysflr/rock.html
articles
http://topics.nytimes.com/top/news/science/topics/volcanoes/index.html
facts
http://www.universetoday.com/32185/10-interesting-facts-about-volcanoes/
http://www.factmonster.com/ipka/A0900642.html
quizzes
http://hs-staffserver.stjames.k12.mn.us/~fraken/Earth%20Science%20Files/Grade%208%20Practice%20Quizzes/volcanoesquiz.html
http://www.enchantedlearning.com/subjects/volcano/cloze/general.shtml
http://www.proprofs.com/quiz-school/story.php?title=igneous-rocks-quiz