volcanoes P1

• What is the Earth's outer layer, where volcanoes are formed, called?

  The crust
• What are tectonic plates?

  Random jagged shapes that divide the Earth's crust
• What are the areas where tectonic plates meet called?

  Plate margins or plate boundaries
• How many types of plate margins are there?

  Three
• What are the three types of plate margins?

  • Destructive: plates collide
  • Constructive: plates pull apart
  • Conservative: plates move side by side
• At which two types of plate margins are volcanoes formed?

  Destructive and constructive
• What type of plate margin forms destructive volcanoes?

  Where two plates collide
• What type of plates must collide to form destructive volcanoes?

  Oceanic and continental
• What geological feature is formed if two continental plates collide?

  Fold mountains
• In a destructive plate boundary, which plate subducts beneath the other?

  The oceanic plate
• What are the cracks in the crust called through which magma rises?

  Vents
• What happens to the oceanic plate as it subducts into the mantle?

  It melts into magma
• What type of volcano is formed at a destructive plate boundary?

  Composite volcano
• What type of plate margin forms constructive volcanoes?

  Where two plates move apart
• What happens when two plates pull apart at a constructive plate boundary?

  A gap is created
• At constructive plate boundaries, what fills the gap created by the plates moving apart?

  Magma
• What type of volcano is formed at a constructive plate boundary?

  Shield volcano