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Glossary of 6th Grade Science Vocab Chpt 6

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A weak spot in the crust where magma has come to the surface.
volcano
The molten mixture of rock-forming substances, gases, and water that makes up part of Earth's mantle.
magma
Magma that reaches the surface;also the rock formed when liquid lava hardens.
lava
A major belt of volcanoes that rim the Pacific Ocean.
Ring of Fire
A string of islands formed by the volcanoes along a deep ocean trench.
island arc
An area where magma from deep within the mantle melts through the crust above it.
hot spot
The pocket beneath a volcano where magma collects.
magma chamber
A long tube through which magma moves from the magma chamber to Earth's surface.
pipe
The opening through which molten rock and gas leave a volcano.
vent
The area covered by lava as it pours out of a volcano's vent.
lava flow
A bowl-shaped area that forms around a volcano's central opening. A round pit on the moon's surface.
crater
A material that is formed from the elements oxygen and silicon; silica is found in magma.
silica
A hot, fast-moving type of lava that hardens to form smooth, ropelike coils.
pahoehoe
A slow-moving type of lava that hardens to form rough chunks;cooler than pahoehoe.
aa
The expulsion of ash, cinders, bombs, and gases during an explosive volcanic eruption.
pyroclastic flow

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