Natural Disasters

• What is a natural hazard?

  Extreme natural events that cause loss of life, extreme damage to property and disrupt human activities
• What are the two categories of natural hazards?

  Tectonic and climatic
• What are tectonic hazards?

  Threats caused by the movement of tectonic plates
• What are climatic hazards?

  Natural disasters caused by weather conditions.
• What are the components of earth’s structure?

  Crust, mantle, core
• What is the mantle made up of?

  Magma
• What are the different plate boundaries?

  Destructive, constructive, conservative
• What happens are destructive plate margin?

  • Oceanic plate moves towards continental plate and submerges underneath the continental plate,
  • Oceanic plate is melted into the magma and pressure builds,
  • Magma rises through a composite volcano
• What are constructive plate margins?

  • Tectonic plates are forced apart,
  • Magma rises and hot rocks melt forming a ridge of volcanoes and new oceanic crust
• What are conservative plate margins?

  • Two plates slide past each other,
  • Friction causes the two plates to stick and pressure builds up,
  • When friction is overcome, the sudden movement at boundary creates an earthquake