Volcanoes Preview 13
Volcanoes
Preview
Volcanoes Preview 13
Explain the relationship between plate tectonics, earthquakes
and volcanoes.
-Explain how Plate Tectonics create earthquakes.
When the plates push together at convergent boundaries the
compression forces create earthquakes. When the plates pull
apart at divergent boundaries the tension forces can create
earthquakes. When the plates slide past each other at transform
boundaries they also catch on each other creating earthquakes.
Volcanoes Preview 13
Explain the relationship between plate tectonics, earthquakes
and volcanoes.
-Explain how Plate Tectonics create volcanoes.
When a plate boundary creates a subduction zone at a
convergent plate boundary, the compression forces create stress
fractures in the other plate. As the plate goes into the mantle, the
magma is forced up through the fractures/cracks to create
volcanoes. At a divergent plate boundary, the plates are pulled
apart leaving a void that is filled by magma that may create
volcanoes.
Volcanoes Preview 13
Explain the relationship between plate tectonics, earthquakes
and volcanoes.
-Explain how earthquakes and volcanoes are related to each
other, other than they are both caused by Plate Tectonics.
Earthquakes and volcanoes are both formed at plate boundaries
by the interaction of the plates. They are usually found in the
same areas. Earthquakes often are a precursor to volcanic
activity.
Volcanoes Preview 13
Explain at least three ways in which earthquake movements
and/or volcanic activity may impact society. You need at least
one example for each.
This is a list not an explanation.
-Damage to structures: freeways, bridges, buildings, homes,
water and gas lines, electrical lines, etc.
-Social and community challenges: lack of food, water, shelter, job losses, higher prices, delayed flights, etc.
-Tsunamis: mass flooding and possible deaths.
Volcanoes Preview 13
Explain what role basaltic magma has in the formation of the
Hawiian Islands. How does the basaltic magma influence the
type of volcano the Hawiian Islands are and their shape?
The basaltic magma that created the Hawaiian Islands in being
pushed up through a hotspot vent at the bottom of the Pacific
Ocean. The basaltic magma is very fluid due to its low silica
content. Because it is so fluid, it has a tendency to create
“gentle” eruptions that allow the lava to flow out instead of
blowing-up violently. Therefore, the resulting shield volcanoes
created are very tall and wide because the lava can flow for
great distances before it cools.
Volcanoes Preview 13
Type of plate boundary?
Volcanoes Preview 13
Type of plate boundary?
Volcanoes Preview 13
Volcano type?
Paricutin
Often along convergent plate
boundaries.
Volcanoes Preview 13
Volcano type?
Mt. St. Helens
Mt. Vesuvius
Krakatoa
Volcanoes Preview 13
Hawaiian Islands are this type of volcano.
Volcano type?
A broad volcano made of flat layers of basaltic lava.
Volcanoes Preview 13
Volcanoes Preview 13
Volcanoes Preview 13