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Main Idea: Volcanoes

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?.

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Main Idea: Volcanoes

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  1. Main Idea: Volcanoes

  2. 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.

  3. 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.

  4. 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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