Science q 3

• Subduction Zone


  where can volcanoes form?
• Subduction Zone


  a region in which a portion of a tectonic plate sinks beneath another plate into the Earth's interior
• Magma


  what forms when water meets subduction zone?
• Subduction Zone


  what are formed when the pacific plate and the continental plates collide??
• Pacific Plate & Continental Plate


  what specific plates need to collide in order to form a subduction zone?
• Pacific Ring of Fire


  this is where most volcanoes in the world are found
• Hotspots


  aside from subduction zones, where else can be volcano was formed?
• Mantle plume


  when this rises, it melts the rock forming a hotspot
• Ash cloud


  a mixture of rock, mineral and glass particles expelled from a volcano during a volcanic eruption
• Crater


  bowl shaped depression on the summit
• Vent


  opening on the Earth's surface where volcanic materials escape
• Side vent


  opening on the side of the volcano
• Conduit


  an underground passage which magma travels through
• Sill


  hardened magma in the crack
• Magma Chamber


  a large pool of liquid rock beneath the surface of the earth
• Lava flow


  stream of molten rock, the pour or ooze from anan erupting vent
• Cinder Cone


  formed from pyroclastic fragments and volcanic ashes expelled during violent eruption
• Scoria Cone


  cinder cone is also called
• Stratovolcano


  composite volcano is also known as
• Shield Cone


  built by countless outpouring of lava from central summit vent
• Composite


  this volcano is tall and cone shaped with alternating layers of lava and ash
• Shield


  Largest volcano
• Shield


  Broad, gently sloping slides and nearly circular base, it is formed by layers of alternating lavalava and ash
• Eruption


  what happens when enough magma builds up in the magma chamber?
• Eruption


  what happens when the pressure is too much as gas bubbles cannot easily escape from a thick or viscous magma?
• Preparation Phase


  magma chamber is filled with magma with dissolved gas
• Preparation Phase


  seismic activity and steam emmision increased
• eruption phase


  pressure and energy build up in the magma chamber
• eruption phase


  magma is pushed out of the opening
• eruption phase


  release of rock fragmentrs, gases, and ashes
• ending phase


  magma chamber is empty
• ending phase


  conduit may weaken and collapse
• effusive


  outpouring of basaltic lava and low in gas content
• explosive


  magma of high viscosity and high gas content
• magmatic


  due to decompression of gas within magma
• hawaiian


  calmest eruption
• hawaiian


  an effusive emmission of highly fluid basalt lava, lava flows in a gentle, low level eruption
• strombolian


  short or mild bursts of glowing lava, created from the bursting of large gas bubble
• strombolian


  consist of ejection of incandescent cinders, lapilli, and lava bombs to altitudes of tens to a few hundred meters
• vulcaninan


  short, violent, small explosion of viscous magma