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chapter 6 volcanoes

chapter 6 vocanoes vocabulary

volcanoes a weak spot in the crust where molten material,or magma,comes to the surface.
magma a molten mixture of rock-forming substances, gases,and water from the mantle
ring of fire a volcanic belt formed by the many volcanoes that rim the pacific ocean
vocanic rocks pumice and obsidian are two types of volcanoe rocks
magma chamber is beneath a vocanoe,magma collects in a pocket
pipe a long tube in the ground that connects the magma chamber to earths surface
vent molten rock and gas leave the volcano through an opening
crater a bowl-shaped area that may form at the top of a volcanoe around the central vent
volcanic eruptions there are two types of volcanic eruption. a quiet eruption and a explosive eruption
dormant a volcano that is sleeping. Will awaken in the future and become active.
extinct a dead volcano that is unlikely to erupt again
sheild volcano has quiet eruptions that gradually build up a gently sloping mountain.
cinder cone volcano erupts ash, cinders, and bombs explosively to form a cone-shaped hill.
composite volcanoes has quiet eruptions that alternate with explosive eruptions, forming tall, cone shaped mountains where layers of lava alternate with layers of ash
lava plateau made up of many layers of thin,runny lava that erupt from long cracks in the ground
calderas a huge hole left by the collapse of a volcanic mountain
Lava when magma reaches the surface.
Hot Spot is an area where material from deep within the mantle rises and then melts, forming magma.
Lava flow is the area covered by lava as it pours out of a vent.
Created by: alikat