Volcanoes Flashcards by Cathy Ray | Brainscape

Q

magma

A

melted rock inside the Earth

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Q

lava

A

melted rock on the Earth’s surface

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Q

volcano

A

a vent through which lava and pyroclastic material continue to erupt

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Q

viscosity

A

the state of being thick, sticky, and semifluid in consistency

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Q

felsic

A

lava that is rich in feldspar and is highly viscous; it is very “thick” and does not flow easily

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Q

mafic

A

lava that is rich in magnesium and has a low viscosity; this means that it can flow very easily.

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Q

hot spot

A

active centers of volcanic activity. Many are located in the middle of tectonic plates. They are found on both continental and oceanic plates.

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Q

crater

A

a bowl- or funnel-shaped depression that usually lies directly above the vent from which volcanic material is ejected

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Q

igneous rock

A

rock that is formed from cooled magma. It can be intrusive or extrusive

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Q

intrusive igneous rock

A

igneous rock that is formed inside the earth

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Q

extrusive igneous rock

A

igneous rock that is formed outside the earth on the surface

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Q

fissure

A

fracture or crack at the Earth’s surface from which lava erupts

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