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This is your cover page. Cut & discard this portion. Types of Volcanoes. Joseph Cardone. Cinder Cones. Cinder Cones. Cut & discard this portion!. Simplest of the volcano types Built from congealed lava flowing from a single vent - PowerPoint PPT PresentationTRANSCRIPT
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Joseph Cardone
Cin
der C
on
esC
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Cinder Cones
• Simplest of the volcano types
• Built from congealed lava flowing from a single vent
• Magma is spewed violently into the air and the cinders fall and collect around the vent.
• Usually have a bowl-shaped crater
• Common in western North America
Photos from the United States Geological Survey (http://pubs.usgs.gov/gip/volc/types.html)
Co
mp
osite
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this portion!Composite
Photos from the United States Geological Survey (http://pubs.usgs.gov/gip/volc/types.html)
• Steep-sided, symmetrical cones
• Form grandiose mountains
• Magma is delivered from the earth through a conduit
• Cones may be eroded over time
• Ex: Mt. Hood & Mt. St. Helens
Sh
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Shield
Photos from the United States Geological Survey (http://pubs.usgs.gov/gip/volc/types.html)
• Built almost entirely from fluid lava flows
• Make up some of the largest volcanoes in the world
• Hawaiian Islands are a chain of this type of volcanoes
• Lava flows out of central vent and rift zones to form a broad field of lava
Lava D
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Lava Domes
Photos from the United States Geological Survey (http://pubs.usgs.gov/gip/volc/types.html)
• Small masses of lava that are too thick to flow very far
• Lava piles up and over its vent
• Lava cools, hardens, then fractures, spilling fragments down its sides
• Common within the craters of larger composite volcanoes