Volcanoes

• What is the outer layer of the Earth called?

  The crust
• What are the shapes of the Earth's crust called?

  Tectonic plates
• What are the areas where tectonic plates meet called?

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

  Three types
• What are the three types of plate margins?

  Destructive, constructive, and conservative
• What happens at destructive plate margins?

  The plates collide towards each other
• What occurs at constructive plate margins?

  The plates pull apart
• What is the movement of plates at conservative margins?

  The plates move side by side in different directions or at different speeds
• Where are volcanoes formed?

  At destructive and constructive plate margins
• How are destructive volcanoes formed?

  When two plates collide with each other
• What types of plates collide to form destructive volcanoes?

  Oceanic and continental plates
• What happens to the oceanic plate when it collides with the continental plate?

  The oceanic plate sinks or subducts beneath the continental plate
• What occurs to the oceanic plate as it sinks into the mantle?

  It melts into a pool of magma
• What is formed when magma rises through cracks in the crust?

  Destructive or composite volcanoes
• How are constructive volcanoes formed?

  When two plates move away from each other
• What happens when the two plates pull apart at constructive margins?

  A gap is created that allows magma to rise up
• What type of volcano is created at constructive margins?

  Shield volcano
• What is an example of a shield volcano?

  The Hawaiian Islands
• What are the processes involved in the formation of volcanoes at different plate margins?

  • Destructive margins: Plates collide, oceanic plate subducts, magma forms and rises, creating composite volcanoes.
  • Constructive margins: Plates pull apart, magma fills the gap, creating shield volcanoes.