Download Chapter 5: Volcanoes

Chapter 5: Volcanoes
ES 5.2 Volcanic Eruptions
S
Inside a Volcano
S Magma Chamber: Collection of magma under volcano
S Pipe: Long tube connecting chamber to surface
S Vent: Opening at top (or sides) where magma leaves
volcano
S Lava Flow: The spread of lava on the surface
S Crater: Bowl shaped feature at the top of volcano that
surrounds the vent
Volcanic Eruptions
S When a volcano erupts, the force of the expanding gases pushes magma
from the magma chamber to the pipe until it flows or explodes out of the
vent.
S Mt. St. Helen’s Volcanic Eruption
S http://youtu.be/xP2dreOI8gI
Types of Eruptions
S Explosive Eruption:
S High Silica Content
S Thick and Sticky
S This magma builds
up in the pipe
S This build up traps
gases
S Then BOOM!!!
S This eruption spreads
ash, cinders, and
bombs!
Types of Eruptions
S Quiet Eruption:
S Hot and/or Low
Silica Magma
S Thin and
Runny/Flows Easily
S Produce different
types of Lava;
creating different
type of igneous rock
S Hawaii was formed
by Quiet Eruptions
Hazards of Quiet Eruptions
S Quick moving lava ran
burn and bury everything
in its path
S Video of slow moving
Lava destroying Hawaii
S http://youtu.be/HpNWL
CmXyTE
Hazards of Explosive Eruptions
S Pyroclastic Flows: A hot,
quick moving cloud of
ash, cinder, and bombs
that moves down the side
of a volcano
S Video of Pyroclastic
Flows:
http://youtu.be/WxlRpu
Ted6g
Stages of Volcanoes
S Active: A volcano that is erupting or showing signs of
eruption in the near future
S Dormant: aka Sleeping… Expected to be active in the near
future
S Extinct: aka Dead… Unlikely to ever erupt again. (Ex: hot
spot volcanoes)