Distribution,frequency and hazards

• 60 % of active volcanoes are located at tectonic plate boundaries
• The frequency (activity) of a volcano depends on the volcano classification. Name the 3 classifications of volcanoes.

  1. Extinct
  2. Dormant
  3. Active
• Some volcanoes, like those that from the Hawaiian Islands, occur at “hot spots.”
• What is a hotspot?

  A hot spot is an area on Earth that exists over a mantle plume - they can cause volcanoes to form away from plate boundaries
• What is Vulcanicity?

  all volcanic activities related to magma being forced into the crust usually at plate boundaries
• Define what a volcano is:

  An opening in the earth's crust connected underground to a magma chamber from which molten lava, gases, steam and pyroclastic materials are ejected
• List the different things that are ejected from volcanoes:

  • Molten lava
  • Gases
  • Steam
  • Pyroclastic material
• Most volcanoes are found along a belt, called the “Ring of Fire” that encircles the Pacific Ocean
• What are Active Volcanoes?

  Volcanoes where eruptions are currently going on
• When are volcanoes classified as dormant?

  If the volcano has not erupted in the last 2000 years
• What are Extinct volcanoes?

  Volcanoes which are never going to erupt again
• Name the different ways volcanoes are categorised:

  1. Shape
  2. nature of their eruptions
  3. Frequency of eruptions
• Mount Kilimanjaro is an example of what type of volcanic frequency?


  Dormant
• Mauna Erebus is an example of which type of volcanic frequency?


  Active
• Mount Snowdon is an example of what type of volcanic frequency?

  Extinct