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Volcano Definitions

TermDefinition
Magma underground molten lava
Lava erupted magma
Vent opening in crust through which magma, ash, and gases are expelled
Crater bowl shaped depression
Cinder Cone type of volcano formed by accumulation of rock fragments
Pahoehoe basaltic lava forming smooth undulating / ropy masses
Aa lava flows with rough rubbly surface composed of broken lava blocks
Tuff porous volcanic rock formed from compacted ash
Pyroclastic Flow fast moving, high density avalanche of hot gas, volcanic ash, pumice and rock fragments
Lava Lake large volumes of molten lava in volcanic vent, crater, etc.
Magma Chamber large reservoir of molten rock beneath earth's surface
Lahar fast moving flood of volcanic water mud and debris
Pillow Basalt type of volcanic rock formed when basaltic lave erupts underwater creating distinct pillowlike shapes
Caldera large cauldronlike volcanic depression
Phreatic eruption steam driven volcanic eruption
Plinian eruption large explosive volcanic event
Dike wall-like body of igneous rock that cuts across existing rock layers
Sill tabular sheet of igneous rock intruded between and parallel with the existing strata
Pluton magma that rises from mantle and cools and crystallizes deep within crust
Lava Tube natural conduit formed by flowing lava that leaves a hollow cave after molten lava drains away
Fumarole opening in or near a volcano through which hot sulfurous gases emerge
Plume towering column of ash gas and rock fragments
Created by: BLD123
 

 



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