Magma 09 : Natural Disaster. Molten rock containing liquids, crystals, and dissolved gases that forms within the upper part of the Earth's mantle and crust. When erupted onto the Earth's surface, it is called lava
County of Humboldt, Volcano Ash Contingency Plan to the Emergency Operations Plan, Glossary, Humboldt Operational Area, Humboldt County Sheriffs Office, Office of Emergency Services, Eureka, CA, USA 2014. http://humboldtgov.org/DocumentCenter/View/6209, (ND/ Volc Emr - Amer) {965}