Types of Volcanoes and Their Formation
Main Idea: Types of
Volcanoes
A. How does a Shield volcano
form?
1.
They form when
layers of lava
accumulate over
time.
2.
The eruptions are
slow and
nonexplosive.
3.
Shield volcanoes
are the largest in
size.
B
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1.
They form when lava
is ejected high into
the air and piles up
around the vent.
2.
Small in size less
than 500 m high.
3.
More explosive than
shield volcanoes,
because magma
contains more water
and silica.
4.
Magma is more
viscous, which leads
to more gas
C. How do Composite-Cone
volcanoes form?
1.
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D. Where on earth can volcanoes
be found?
1.
V
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E. Hot spots
1.
Areas on Earth’s
mantle where high
temperature causes
sections of earth to
rise (Hawaii).
2.
The heat melts the
rock, which is forced
to the surface as
magma.
3.
The magma melts
the crust forming
volcanoes.
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Explore the unique characteristics and formation processes of shield, cinder-cone, and composite-cone volcanoes. Learn about their sizes, eruption styles, and locations on Earth, including along plate boundaries and hot spots.
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Presentation Transcript
Main Idea: Types of Volcanoes
A. How does a Shield volcano form? 1. They form when layers of lava accumulate over time. The eruptions are slow and nonexplosive. Shield volcanoes are the largest in size. 2. 3.
B. How does a Cinder-Cone volcano form? 1. They form when lava is ejected high into the air and piles up around the vent. Small in size less than 500 m high. More explosive than shield volcanoes, because magma contains more water and silica. Magma is more viscous, which leads to more gas 2. 3. Cinder cone on Mauna Kea Volcano, Hawai`i. 4.
C. How do Composite-Cone volcanoes form? 1. These volcanoes form when layers of lava alternate with layers of volcanic fragments (ash, tephra). Larger than cinder- cone Are the most dangerous of all volcanoes 2. 3.
D. Where on earth can volcanoes be found? 1. 2. 3. 4. Volcanoes are found along plate boundaries. 80 % on convergent boundaries 15 % on divergent boundaries 5 % occur away from plate boundaries
E. Hot spots 1. Areas on Earth s mantle where high temperature causes sections of earth to rise (Hawaii). The heat melts the rock, which is forced to the surface as magma. The magma melts the crust forming volcanoes. 2. 3.
This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.
