tectonics

• the global distribution of earthquakes, tsunamis and volcanos is linked to plate boundaries
• destructive plate boundary- where an oceanic plate and continental plate converge

  e.g. west coast of South America
• constructive plate boundary - where two oceanic plates converge e.g. mid atlantic ridge
• transform plate boundary - where two plates slide past one another e.g San Andreas fault
• collision- when two continental plates converge
• causes of tectonic hazards- volcanic

  • volcanoes, often explosive, are found in the andes fold mountains because unstable mantle material and melted oceanic plate force their way to the surface
  • gentle volcanic activity is found at constructive plate margins as mantle material moves upwards to fill the gaps left by diverging plates