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Volcanoes and Plate Boundaries

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by

Dan Grubb

on 30 January 2015

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Transcript of Volcanoes and Plate Boundaries

Volcanoes and Plate Boundaries
Volcano: is a land or underwater feature that forms when magma reaches the surface of the Earth.
Molten rock moves because it is less dense than surrounding rocks
Volcanoes cause the eruption of
liquid
,
gas
or
solid
materials
.
Density of magma depends upon its 1.
Composition
2. The amount of
dissolved gas
3. It's
temperature
Lava Lamp Density
Where do volcanoes occur?
They occur mostly along
convergent
,
divergent
plate boundaries and
hot spots
Ring of Fire
Stop at 1:18
45 min video
Convergent Plate Boundaries
Tend to erupt more violently!
Form
Volcanic Arcs =
Mountain ranges on the coast
Form
Island Arcs =
Volcanic islands
Divergent plate boundaries
A huge crack or rift in Earth's surface.
Can occur at a
mid ocean ridge

or on a
continent
as a continental rift.
Can even form a new island.
Rift valley formation
Most of the eruption comes out of the volcanoes
vent
where a cone shape develops.
As the lava flows out it cools quickly and becomes solid rock. the steep walled depression around the vent is the
crater
.
Heat Escapes
Fissure Eruptions
Underwater fissure eruptions
Fissure eruption on land
Stop at 1:24
2:00 min video
No volcano is formed, the eruption comes from a crack in the ground.
Hot Spots
A volcano no where near a plate boundary.
Heat and pressure from the Earth's interior cause rock to melt and become magma.
Divergent
Divergent
Convergent
Convergent
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Full transcript