Tephra, Ash and fragmented rock, Pyroclastic flow, Hot steam and ash that travels at 800 km/hr, Basic Lava, Less than 55% silica, Acidic Lava, Greater than 55% silica, Caldera, A collapsed volcano, Volcanic Plug, A vent solidified by hardened lava, Parasitic cone, A smaller volcanic cone that builds up on the side of a main volcano, Secondary vent, Area where magma comes out of the side of a volcano, Volcanic bombs, Rocks blasting out of a volcanic eruption, Lahar, Mudflow caused by a volcanic eruption, Geothermal energy, Heat from the earth by way of steam, Geyser, Eruption of hot water and steam, Fissure, Crack basic lava pours out of, Basalt rock, Cooled and hardened basic lava, Granite rock, Cooled and hardened acidic lava, Hotspots, Unusual large plume under the crust, Constructive plate boundary, North American and Eurasian plates, Destructive plate boundary, Nazca and South American plates, Active volcano, Mt. Etna, Extinct volcano, Mt. Slemish, Extrusive, Features formed from lava cooling on the earth surface, Intrusive , Features formed from lava cooling in the earth' s crust.

Volcanic Terms

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