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Lesson 3

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by

Kerry DeWeese

on 18 November 2015

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Transcript of Lesson 3

Lesson 3
Volcanoes

When a volcano is about to erupt, hot rock inside the volcano pushes up and increases the steepness of the slope of the volcano. How can scientists predict whether a volcano will erupt?
Kilauea Volcano, Hawaii
A volcano is an opening in the Earth's crust.
More than 80% of Earth's volcanic activity occurs on the ocean floor.
Mt. Kilauea, Hawaii
Shield volcanoes are built by thinner, fluid lava that spreads over a large area. These mountains have a broad base and gently sloping sides.
Mt. Capulin, New Mexico
Cinder-cone volcanoes are built by thick lava that is thrown high into the air and falls as chunks or cinder.
These mountains form as a cone shape with a narrow base and steep sides.
Stromboli Italy
Composite volcanoes are built by layers of ash and cinders sandwiched between layers of hardened lava. The shape of a composite volcano usually looks the same as the shape on the opposite side.
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