Q1M3W3- EarthSci

• When an oceanic crust converges with a

  continental crust, a crack between the crusts underwater, called trench, is formed.
• Subduction is the process

  by which a plate dives under a less dense plate.
• It turns into a hot molten

  material which we call magma.
• The column of rising magma is called

  a mantle plume.
• a group of volcanoes, called volcanic arc
• This is what we call

  tsunamis, a Japanese term for harbor wave.
• This series of volcanoes is called volcanic island arc

  since it is surrounded by water.
• Converging continental crusts or

  plates result in a collision zone, which

  could cause shallow earthquakes.
• A vertical space that may extend deep down into the lowest

  layer of the crust is created, it is a rift valley.
• The force of separation creates a

  tension zone.
• These materials pile up near the tension zone

  forming mountain-like structures called oceanic ridges.
• The filled-up space between the plates becomes a

  new seafloor. This process is known as seafloor spreading.