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chapter 6 volcanoes
chapter 6 vocanoes vocabulary
Question | Answer |
---|---|
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. |