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Volcanoes and Plate Boundaries
Transcript of 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
Density of magma depends upon its 1.
2. The amount of
Lava Lamp Density
Where do volcanoes occur?
They occur mostly along
plate boundaries and
Ring of Fire
Stop at 1:18
45 min video
Convergent Plate Boundaries
Tend to erupt more violently!
Volcanic Arcs =
Mountain ranges on the coast
Island Arcs =
Divergent plate boundaries
A huge crack or rift in Earth's surface.
Can occur at a
mid ocean ridge
or on a
as a continental rift.
Can even form a new island.
Rift valley formation
Most of the eruption comes out of the volcanoes
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
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.
A volcano no where near a plate boundary.
Heat and pressure from the Earth's interior cause rock to melt and become magma.
Video can start loud
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