Download volcanoes

By Robbie Barker, Maximilian Bryson,
and Brendan Petrili
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A volcano is an opening in the Earth’s surface
through which magma rises.
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1.Most volcanoes occur at colliding boundaries.
A. less dense magma rises up through the
fault.
2.Other volcanoes occur at spreading
boundaries on the ocean floor.
A. calmer eruptions-lava flows onto the
ocean floor.
B. a new floor is created.
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1. shield-formed from lava flows that harden.
2. cinder cone volcano-formed from explosive
eruptions in which volcanic materials are
thrown high in the air and pile up around the
vent of volcano.
3. composite-formed from alternating lava
flows and explosions.
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1. crater-deep sided depression at the top or on
the side of a volcano formed during an
eruption.
2. magma- molten rock inside the Earth.
3. lava- molten rock which reaches Earth’s
surface.
4. caldera- crater at least 1.6 km wide.
5. geysers- groundwater heated by boiling
trapped magma which erupts on the Earth’s
surface. Example: Old faithful.
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6. volcanic ash- tiny bits of rock that fly into the
air during an eruption, can form a thick cloud
of ash and cinders.
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1. Volcanic flow can reach up to 2000 degrees
Fahrenheit.
2. the less gas the less dramatic eruption.
3. 260,000 people have died in the last 300 years
due to volcanic eruptions.
4. 90% of all volcanoes are in the Ring of Fire
along the edges of the Pacific Ocean.
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5. about 1900 volcanoes are likely to explode
again.
6. Ash and toxic gasses can cause lung damage.
7. Volcanoes usually exist along the edges of
tectonic plates.
Mount St. Helens- last eruption is in 2008
Mount Barker- last eruption in 1880
Gorda Ridge- last eruption in 1996
Northwest Rota- last eruption 2004
Kilauea- last eruption 2010
Mount Cleveland- last eruption 2008