Tectonic hazards

• 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 converge towards each other
• What occurs at constructive plate margins?

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

  They move side by side at different speeds
• Where are volcanoes formed?

  At destructive and constructive 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 during subduction?

  It sinks beneath the continental plate
• What is formed from the melting of the oceanic plate?

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

  Through cracks in the crust called vents
• How are constructive volcanoes formed?

  When two plates move away from each other
• What happens when 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
• 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 subducts, magma rises, forms composite volcanoes.
  • Constructive margins: Plates pull apart, magma fills gap, forms shield volcanoes.