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Volcanic Activity
Chapter 18
Intrusions
Igneous __________classified
by shape, size, and orientation
Major Volcanoes Around the World
There are three types of
volcanic cones:
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Cinder – explosive eruptions, small but
______
steep slopes, pyroclastics
Shield – nonexplosive eruptions, fluid
_______
basaltic lava, gentle broad slopes
Composite – alternating between lava
_________
and pyroclastics, explosive and
nonexplosive eruptions, steep and tall
The _________
Galapagos Islands are a volcanic
group of islands 600 miles off the
coast of Ecuador on the equator.
Lava flowing underground created
lava _____,
tube large enough to
this _____
walk through.
Kilauea on Hawaii is a good example of
shield
a _______
cone, with less explosive
eruptions and less viscous lava.
Mt Rainier and Mt St Helens are good
examples of __________
composite cones, with
explosive eruptions and erupted materials
such as ash, bombs, and blocks.
Mt St Helens
Mt Rainier
Crater Lake in Oregon is a __________formed
caldera
from the collapse of the gigantic volcano Mount
Wizard Island
Mazama. ________________in
the center of
the lake is a small cinder cone.
Volcanoes Review:
Fast-moving clouds of gas, ash, and
pyroclastic flows _
other tephra are called ____________
 Large, rounded tephra are called
__________
volcanic
bombs .
shield cones.
 Iceland and Hawaii have ______
 A mushroom-shaped igneous intrusion
laccolith
is a ______________.
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