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Joseph Cardone

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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)

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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

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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

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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