Main Idea: Volcanoes.

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Presentation transcript:

Main Idea: Volcanoes

A. Structure of volcano Volcanoes contain a vent, crater and slopes. A vent is an opening in the crusts surface in which lava is emitted. A crater is connected to the magma chamber that is located near the vent.

B. What is a caldera? A caldera is sometimes confused with a crater. They differ in size. A caldera is around 50 km in diameter, while a crater is at most 1 km in diameter.

C. How is a caldera formed? A caldera is formed when the slopes of a volcano collapse. The top of the magma chamber becomes empty from lava flow. The caldera then fills up with water forming a lake.

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