Volcano

• Ring of fire- refers to the region around the Pacific Ocean that are common hit by the eartquakes and volcanic eruption
• Volcano- is a vent or chimney that connects molten rocks (magma) from within the Earth's crust
• PHIVOLCS- Philippines Institute of Volcanology and Seismology
• Classification of Volcano :

  1. Active
  2. Inactive
  3. Extinct
• Parts of Volcano:

  1. Summit
  2. Crater
  3. Slope
  4. Base
  5. Caldera
• Shield volcanoes - have a slow sloped and consist of frozen lava after it is hardened
• Cinder cone- consist of mostly loose grainy cinders and have very little to no lava
• Composite volcanoes- large and have nearly perfect slope
• Caldera volcanoes- are circular depressions in the ground over a magma chamber
• Fissure volcanoes- have no main crater, the ground just splits and lava pours outs through the cracks
• Types of eruption:

  1. Violent- explosive eruptions
  2. Non-violent- calm or quiet eruptions
• Phreatic or Hydrothermal- is a stream driven eruption that occur hot rock or hot spring
• Phreatomagmatic- violent reaction due to the contact between water and magma
• Strombolian- a periodic weak to violent eruption characterized by fountain lava
• Vulcanian- characterized by tall eruption with pyroclastic flow and ashfall tephra
• Plinian- excessively explosive type of eruption of gas and pyroclastics