Volcanoes

• What is the outer layer of the Earth called?

  The crust
• What are tectonic plates?

  Random jagged shapes in 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 types
• What are the three types of plate margins?

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

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

  The plates pull apart from each other
• What is the movement at conservative plate margins?

  The plates move side by side at different speeds
• 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 during subduction?

  It sinks beneath the continental plate
• What is formed when the oceanic plate melts?

  A pool of magma
• How does magma reach the surface?

  Through cracks in the crust called vents
• What type of volcano is formed at destructive margins?

  Composite volcanoes
• How are constructive volcanoes formed?

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

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

  Shield volcanoes