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Intro to volcano basics.

Alfonso Gonzalez

on 12 April 2010

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Transcript of Volcanoes

Volcanoes form when magma breaks through weak spots in the Earth's crust!
Aside from hotspots, volcanoes are formed
at tectonic plate boundaries. Divergent boundaries
have fewer volcanoes form than convergent
boundaries. Massive plates subducting into the
mantle create chains of active volcanoes like at
the Ring of Fire!
Strato cones or composite cones
are very recognizeable because
they form huge volcano mountains.
Mt Saint Helens is an example of a
composite cone volcano that forms
from explosive ashes and cinders as
well as lava flows.
Here's Mt Saint Helens.
Composite Volcanoes
can really erupt!
Cinder cones erupt
explosively all the
time! They are built up
by ash and cinders.
Here's a sample
of how a cinder cone
volcano is formed.
Shield volcanoes are the most
spectacular! The Hawaian islands
are the most famous shield volcanoes.
They are formed my flowing lava!
Fast Flowing, super hot lava!
Full transcript