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16 terms

Intrusive and Extrusive Volcanic features

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Fumeroles
Holes in the ground which generate steam or hot gases from below. Often harnessed to make electricity in areas of active volcanism.
Geyser
A fountain of water and steam that builds up pressure underground and erupts at regular intervals.
Bubbling mud
Where mud is melted and mixed with water by geothermal heat
Geothermal
of or relating to the heat in the interior of the earth
Hot springs
formed when magma heats groundwater and the water rises and collects in a natural pool.
Solfatera
Mounds of sulphur precipitated out of heated volcanic waters
Extrusive volcanic Features
Those landforms formed by vulcanism that are created AT the surface, can be small or major features
Shield volcano
A low, flat, gently sloping volcano built from many flows of fluid, low-viscosity basaltic lava
Strato volcano
The most common volcano. Known for its layers of lava flows and cinder. Built up by violent eruptions that leave the tephra followed by calm eruptions that leave lava flows. They build tall and steep volcanoes.
Dome volcano
a volcano with steep sides that is formed by thick Rhyolitic lava flows
Caldera
a large crater caused by the violent explosion of a volcano that collapses into a depression
Lava Plateau
a wide, flat landform that results from repeated nonexplosive eruptions of lava that spread over a large area
Intrusions
Volcanic features fomed where magma is cooled INSIDE the Lithosphere to be later exposed by denudation
Dyke
Thin vertical veins of igneous rock that form when magma enters and cools in fractures found within the crust.
Sill
A flat, horizontal mass of igneous rock between two layers of older sedimentary rock
Metamorphic rocks
Rocks formed when other rocks are put under extreme heat and pressure