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7th Grade Science Chap 3


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a weak spot in the crust where magma comes to the surface
a molten mixture of rock forming substances, gases, and water from the mantle
magna that has reached the surface
ring of fire
a major volcanic belt that encircles the Pacific Ocean
diverging boundaries
plate boundaries along which volcanoes form
island arc
a string of islands that were created by a volcanic hot spot
hot spot
an area where magma from deep within the mantle melts through the crust above it
Where are most of Earth's volcanoes found?
mostly along plate boundaries
How do hot spot volcanoes form?
when magma erupts through the crust and reaches the surface
an element is a substance that cannot be broken down into other substances
a compound is a substance made of two or more elements that have been chemically combined
physical property
any characteristic of a substance that can observed or measured without changing the composition of the substance
chemical property
any property of the substance that produces a change in the composition of matter
the resistance of a liquid to flowing
a material found in magma that has formed from the elements of oxygen and silicon
a hot fast moving type of lava that hardens to form smooth rope-like coils
a slow moving type of lava that hardens to form rough chunks
magma chamber
the pocket beneath a volcano where magma collects
a long tube through magma moves fro mthe magma chamber to the earth's surface
the opening through which molten rock and gas leave a volcano
lava flow
the area covered by lava as it pours out of a volcano's vent
a bowl shaped area that forms around a volcano's central opening
pyroclastic flow
the expulsion of gas, ash, cinders and bombs during an explosive volcanic eruption
describes a volcano that is not currently active but may become active in the future
describes a volcano that is no longer active and is unlikely to erupt again
shield volcano
a wide gently sloping mountain made of layers of lava and formed by quiet eruptions
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 mountain in which layers of lava alternate with layers of ash and other volcanic materials
the large hole at the top of a volcano when the roof of a volcano's magma chamber collapses

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