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18 terms

Volcanoes

7th Grade Science
STUDY
PLAY
Folded Mountain
A mountain that forms as continental crust crumples and bends into folds
Fault-block Mountain
A mountain that forms where a normal fault uplifts a block of rock
Mountain Belt
Mountain ranges and mountain systems in a long connected chain.
Volcanoes
Openings in Earth's crust from which molten rock, dust, ash, and hot gases flow or erupt
Lava
Magma that reaches Earth's surface
Pyroclastic Flow
A hot, high-velocity mixture of ash, gas and fragmented rock that flows like a liquid down slopes and over terrain.
Shield Volcano
A low, flat, gently sloping volcano built from many flows of low-viscosity basaltic lava.
Cinder Cone Volcano
A steep, cone-shaped hill or small mountain made of volcanic ash, cinders, and bombs piled up around a volcano's opening
Composite Volcano
A tall, cone-shaped hill in which layers of high silica lava alternate with layers rock fragments.
Caldera
A large crater caused by the violent explosion of a volcano that collapses into a depression
Hot Springs
A pool formed by groundwater that has risen to the surface after being heated by a nearby body of magma.
Geyser
A fountain of water and steam that builds up pressure underground and erupts at regular intervals
Fumarole
A vent in a volcanic area from which fumes or gases escape
Deep-Sea Vent
A dark, hot, oxygen-deficient environment associated with volcanic activity on or near the seafloor spreading centers.
Magma
Molten rock beneath the earth's surface
Active
A volcano that is erupting or has erupted recently.
Dormant
A volcano that has not erupted recently, but may do so in the future.
Extinct
A volcano that will not erupt again.