L1 Volcanoes

• According to PHIVOLCS, volcanism and earthquakes are ideal because it is situated along the ________________ 


  Pacific Ring of Fire
• What are the two boundaries of two tectonic plates situated along the Pacific Ring of Fire?


  Philippine Sea and the Eurasian Plate
• ______ refers to any phenomenon of eruption of molten lava

  onto the surface

  Volcanism
• A ______ is a hill, mountain, or fissure from

  which molten rocks, hot gases, and ash are

  ejected

  Volcano
• A ''bump" in the landscape, created by faulting or erosion. It is often unnamed

  Hill
• A steep rise in the landscape, created by faulting. Often named

  Mountain
• It is a funnel-shaped depression at the top of a

  volcano formed as a result

  of explosive eruption

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


  Caldera
• Comes out of a vent. These are molten rocks inside the earth


  Magma
• Magma that has been ejected

  out of a volcano

  Lava
• What are the three parts of a volcano?

  Summit/Peak, Slope/Middle, and Base/Lowest
• Erupted within the last 600 years and with records of eruption within the last 10, 000 years

  Active volcano
• No records of eruption over the last 2000

  years but may erupt at a future time

  Dormant
• No records of eruption over the

  last 10, 000 years. And has no capacity to erupt in

  the future

  Extinct/Inactive volcano
• This volcanic structure has a bowl-shaped crater at the peak.


  Cinder
• These are large, broad volcanoes that look similar to shields


  Shields
• The channel or passage, which may be pipe-shaped, that brings magma from a reservoir or chamber to the vent at the surface where it is erupted


  Conduit
• A volcanic structure with a dome-shaped mass within the crater


  Dome
• These are large, typically steep-sided, cone-shaped volcanic structures. It has a conduit system.


  Composite
• Large depressions due to the withdrawal of magma from beneath the volcano

  Caldera
• This is a type of eruption that is quiet or nonexplosive 


  Effusive
• This is a type of eruption that is destructive


  Explosive
• A steam-driven eruption as the hot rocks come in

  contact with water

  Phreatic
• Characterized by tall eruption that reach up to 20 km high with pyroclastic flow and ashfall tephra (explosive)

  Vulcanian
• A period weak to violent eruption characterized by fountain lava

  Strombolian
• Associated with explosive outbursts that generate pyroclastic flows and dense mixtures of hot volcanic fragments (highly explosive)

  Pelean
• A violent eruption due to the contact between water and magma


  Phreatomagmatic
• An excessive type of eruption

  of gas and pyroclastics (extremely explosive)

  Plinian