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Main Idea: Volcanoes - PowerPoint PPT Presentation


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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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a structure of volcano
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
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
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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