Volcanic Activity

1
Volcanic Activity

• Chapter 18

2
Igneous __________- classified by shape, size,
and orientation
Intrusions
3
Major Volcanoes Around the World
4
There are three types of volcanic cones
Cinder

• ______ explosive eruptions, small but steep
  slopes, pyroclastics
• _______ nonexplosive eruptions, fluid basaltic
  lava, gentle broad slopes
• _________ alternating between lava and
  pyroclastics, explosive and nonexplosive
  eruptions, steep and tall

Shield
Composite
5
The _________ Islands are a volcanic group of
islands 600 miles off the coast of Ecuador on the
equator.
Galapagos
6
Lava flowing underground created this _____
_____, large enough to walk through.
lava
tube
7
Kilauea on Hawaii is a good example of a _______
cone, with less explosive eruptions and less
viscous lava.
shield
8
Mt Rainier and Mt St Helens are good examples of
__________ cones, with explosive eruptions and
erupted materials such as ash, bombs, and blocks.
composite
Mt St Helens
Mt Rainier
9
Crater Lake in Oregon is a __________formed from
the collapse of the gigantic volcano Mount
Mazama. ________________in the center of the lake
is a small cinder cone.
caldera
Wizard Island
10
Volcanoes Review

• Fast-moving clouds of gas, ash, and other tephra
  are called ____________ _
• Large, rounded tephra are called __________ .
• Iceland and Hawaii have ______ cones.
• A mushroom-shaped igneous intrusion is a
  ______________.

pyroclastic flows
volcanic bombs
shield
laccolith