en.wikipedia.org/wiki/Volcano

A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber ...

www.livescience.com/27295-volcanoes.html

Feb 6, 2018 ... A volcano is an opening in Earth's crust where magma breaks through, raining down molten rock, ash and gases. There are several types of ...

www.ready.gov/volcanoes

A volcano is an opening in the Earth's crust that allows molten rock, gases, and debris to escape to the surface. Alaska, Hawaii, California, and Oregon have the  ...

www.volcanodiscovery.com/volcanoes.html

Active volcanoes worldwide - short information / VolcanoDiscovery.

www.weatherwizkids.com/weather-volcano.htm

Volcanoes are formed when magma from within the Earth's upper mantle works its way to the surface. At the surface, it erupts to form lava flows and ash deposits  ...

geology.com/volcanoes

Articles, facts, information and photos for volcanoes and volcanic activity. | Geology.com.

www.usgs.gov/products/data-and-tools/real-time-data/volcanoes

See real-time alerts for U.S. volcanoes, subscribe to notification services, or choose an observatory that monitors and studies the geology and hazards of their ...

www.ask.com/youtube?q=Volcanoes&v=WgktM2luLok
Nov 12, 2012 ... Watch more films and find learning materials at http://www.twig-world.com The cycle of lava as a destructive and constructive force, building the ...

volcanoes.usgs.gov/index.html

Jul 10, 2017 ... U.S. Volcanoes and Current Activity Alerts. Activity Alerts: Volcano Notification Service | Volcano Observatory Notices for Aviation. Zoom to ...