Volcanoes. A Volcano is… A geographic feature on the Earth’s surface (as well as other planets)...
-
Upload
elizabeth-nichols -
Category
Documents
-
view
224 -
download
0
description
Transcript of Volcanoes. A Volcano is… A geographic feature on the Earth’s surface (as well as other planets)...
Volcanoes
A Volcano is…
• A geographic feature on the Earth’s surface (as well as other planets) where magma erupts through the Earth’s surface.
• Volcanoes tend to exist on or near plate boundaries, however there are exceptions.
• There are three different types of volcanoes as geologists have classified them. Each will be discussed briefly in this presentation.
Shield Volcano
• Shield volcanoes are built almost entirely of fluid lava flows, which flows and hardens over time.
• This creates a mellow slope, a volcano which resembles a warriors shield, which is where it got its name.
• Some of the largest volcanoes in the world are shield volcanoes.
Picture of a Shield Volcano
Composite/Strato Volcano
• Composite, also known as stratovolvanoes are large, steep sided volcanoes built of alternating layers of lava flows, volcanic ash, and cinders.
• Composite volcanoes have a magma reservoir deep in the Earth’s crust from which the magma rises.
Picture of a Composite Volcano
Cinder Cone Volcano
• Cinder cone volcanoes are the simplest type of volcano.
• They are built from blobs of congealed volcanoes ejected from a single vent.
• Most Cinder cones are relatively small, most of them being less than 1000 feet.
Picture of a Cinder Volcano
Our Model Volcano
• Our model volcano is most like a Cinder Cone Volcano, in that it has very steep sides.
• Our volcano may or may not shoot out magma as a cinder cone would.
• Our model, in reality has some characteristics of both stratovolcanoes and cinder cones. Overall, however, I think it resembles a cinder cone more closely.
Works Cited
• http://vulcan.wr.usgs.gov/glossary• http://volcanoes.usgs.gov/imgs/jpg/photogl
ossary/shieldvolcano• http://www.swisseduc.ch/stromboli/glossar
y/icons/stratostrombolib.jpg