quater 3

• Volcanism


  Any phenomenon of eruption of molten lava onto the surface, whether from a tall volcano or simply from magma that rises through a crack on a planet's lithosphere
• Volcano


  A hill, mountain, or fissure from which molten rocks, hot gasses, and ash are ejected
• Volcano


  • Built through the build up of molten lava cooling and hardening
• Mountain


  • Built by two plates at a convergent boundary
• Parts of a Volcano


  • Crater
  • Caldera
  • Magma
  • Lava
• Crater


  A funnel-shaped depression at the top of a volcano formed as a result of explosive eruption
• Caldera


  A volcanic crater that is formed when a part of the wall of the crater collapses following an explosive eruption
• Magma


  Molten rocks inside the earth
• Lava


  Magma that has been ejected out of a volcano
• Classification of volcanoes based on frequency of eruption

  • Active
  • Dormant
  • Extinct
• Active volcano


  Erupted within the last 600 years and with records of eruption within the last 10,000 years
• Dormant volcano


  No records of eruption over the last 2000 years but may erupt at a future time
• Extinct volcano


  No records of eruption over the last 10,000 years, no capacity to erupt in the future
• Volcanic structure types


  • Cinder
  • Shield
  • Composite
• Cinder cone volcano


  • Formed by violent eruptions that released small fragments of lava into the air, most have a bowl-shaped crater at the peak
• Cinder cone volcanoes


  • Parícutin, Sunset Crater, Smith volcano, Taal volcano, Mount Mayon, Mount Musuan
• Shield volcano


  • Large, broad volcanoes that look similar to shields, magma flows out gently around a central opening
• Shield volcanoes


  • Mauna Loa, Erta Ale
• Composite volcano


  • Large, typically steep-sided, cone-shaped and are composed of hardened layers of lava and ash, cinders, and rock fragments, has a conduit system through which magma rises to the surface
• Composite volcanoes


  • Mount Vesuvius, Mount Tambora, Mount Pinatubo, Mount Arayat, Mount Kanlaon, Mount Apo, Mayon Volcano
• Volcanism


  Any phenomenon of eruption of molten lava onto the surface, whether from a tall volcano or simply from magma that rises through a crack on a planet's lithosphere
• Volcano


  A hill, mountain, or fissure from which molten rocks, hot gasses, and ash are ejected
• Volcano


  • Built through the build up of molten lava cooling and hardening
• Mountain


  • Built by two plates at a convergent boundary
• Crater


  A funnel-shaped depression at the top of a volcano formed as a result of explosive eruption
• Caldera


  A volcanic crater that is formed when a part of the wall of the crater collapses following an explosive eruption
• Magma


  Molten rocks inside the earth that comes out of a vent
• Lava


  Magma that has been ejected out of a volcano
• The Philippines sits on a unique tectonic setting ideal to volcanism and earthquake because it is situated along the Pacific Ring of Fire at the two boundaries of two tectonic plates
• The Philippines has many volcanoes because of its location along the Pacific Ring of Fire at the boundaries of two tectonic plates
• Type of volcanic activity

  • Active
  • Dormant
  • Extinct
• Active


  Erupted within the last 600 years and with records of eruption within the last 10,000 years
• Dormant


  No records of eruption over the last 2000 years but may erupt at a future time
• Extinct


  No records of eruption over the last 10,000 years. No capacity to erupt in the future
• Active volcanoes


  A volcano which has erupted recently
• Dormant volcanoes


  A volcano which has erupted in the 2000 years, but not recently is dormant or asleep
• Extinct volcanoes


  A volcano which is unlikely to erupt ever again is dead or extinct