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Important Volcano Facts
 Most of Earth’s volcanoes are _______________.
 There are more than 600 __________ volcanoes.
 Magma( A) is ______ ______ than the rock (B) around it. Because of
this, magma _________ towards Earth’s surface.
Lease dense
magma
 Volcanoes occur 3 places:
1. divergent boundaries
 At divergent boundaries
under water, long deep
cracks called ______ are
formed. Magma flows
through these cracks and is
______ by seawater.
2. convergent boundaries
o At convergent boundaries, magma is created in the subduction
zone and forced ______ to the surface.
Subduction zones occur when
_____ _________ oceanic plate
sinks below the ______ dense
continental plate, allowing
least dense magma to rise.
3. hot spots (hotspots):
is a portion of the Earth's surface that may be far from tectonic plate
boundaries and that experiences
volcanism due to a rising mantle
plume, such as in
__________. Plate
__________ past the plume
creating a ________ of
volcanoes.

Hot spots are extremely _____ areas of the mantle, where magma is
forced up through the crust to form new land.