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VOLCANOss
VOLCANO-LAST 16
Question | Answer |
---|---|
magma chamber | the pocket beneath a volcano where magma collects. |
pipe | a long tube through which magma moves from the magma chamber to Earth's surface |
vent | 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 |
crater | a bowl-shaped area that forms around a volcano's |
pyroclastic flow | the expulsion of ash, cinders, bombs and gases during an explosive volcanic eruptions |
dormant | describes a volcano that is not currently active, but that may become active in the future |
extinct | describes a volcano that is no longer active and is unlikely to erupt again |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 | 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 |
caldera | the large hole at the top of a volcano formed when the roof of a volcano's magma chamber collapses |
volcanic neck | a deposit of hardened magma in a volcano's pipe |
dike | a slab of volcanic rock formed when magma forces itself across rock layers |
sill | a slab of volcanic rock formed when magma squeezes between layers of rock |
batholith | a mass of rock formed when a large body of magma cools inside the crust |
geothermal activity | the heating of underground water by magma |
geyser | a fountain of water and steam that builds up pressure underground and erupts at regular intervals |