PLATE TECTONICS

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PLATE TECTONICS

• PLATE BOUNDARIES

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DIVERGENT PLATE BOUNDARIES

• Plates move _____ from each other, creating new
  _____ floor. This occurs where a __________ cell
  comes up, breaks through the crust (creating a
  rift -- deep crack in crust), and deposits dark,
  heavy lava on the surface by volcanoes (this
  becomes the ridge, and the new oceanic crust)
• Result Rifts and Ridges, new crust, and oceans
• Example _____-______Rift and Ridge, and the
  _______crust under the Atlantic Ocean
• Draw the arrows

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CONVERGENT PLATE BOUNDARIES

• One plate with oceanic crust at the front
  collides with another plate with continental
  crust at the front. The __________oceanic crust
  goes beneath the lighter _____________ crust,
  creating a trench and dragging "scum" down that
  melts and explodes back up in explosive
  volcanoes.
• Result trench and volcanic mountain chains
• Example Philippine Trench and Sierra Nevada
  Mountain Range
• Draw the arrows

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CONVERGENT PLATE BOUNDARIES

• One plate with oceanic crust at the front
  collides with another plate with oceanic crust at
  the front. The _________ of the two crusts goes
  beneath the other, creating a trench and dragging
  "scum" down that melts and explodes back up in
  explosive volcanoes.
• Result trench and volcanic island arcs
• Example Aleutian Trench and Aleutian Islands
• Draw the arrows

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CONVERGENT PLATE BOUNDARIES

• One plate with continental crust at the front
  collides with another plate with continental
  crust at the front. Rather than going under both
  crusts buckle, __________ mountains upward.
• Result _________mountains
• Example Himalyas and Appalacian Mts.
• Draw the arrows

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TRANSFORM PLATE BOUNDARIES

• Two plates _________past each other.
• Type of plate movement that caused the earth
  quake in Haiti
• Example San Andreas Fault
• Draw the arrows

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EARTHS LAYERS

• ___________ the relatively thin, solid, outer
  layer of Earth.
• ___________ Crust composed of relatively
  lightweight (and light in color) rocks. This is
  the "scum" of the Earth, the lightest weight
  stuff that has floated to the surface of the
  Earth and upon which we walk.
• __________ Crust composed of relatively heavy
  (and dark in color) rocks. This is the stuff
  forced to the surface by convection cells (see
  image). Because it is so dense and heavy, it is
  thinner and sinks deeper into the mantle, thus
  produces ocean basins.

__________ the thick, semi-solid, middle layer
of Earth that slowly flows circular _________
cells. the uppermost part of the mantle is solid
and, together with the crust, forms what is
called the lithosphere. The layer of the mantle
below the lithosphere, that is malleable like
butter, is called the _________________ and this
is the layer that the lithosphere depresses and
moves across. __________ the core consists of
two layers, an outer liquid layer and an inner
solid layer.
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CONVECTION CELLS

• _________________ are the slow moving currents of
  mantle material from deep in the mantle, up to
  the surface, then along the surface, then
  eventually sinking back deep in the mantle.
• They are powered by Earth's interior heat and
  break the crust into pieces (called plates).
• Draw a convection current

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Plates

• __________ are pieces of the Earth's crust broken
  apart and moving by the action of convection
  cells.
• convection cells causing plates to move, the
  piece of lithosphere with the arrows pointing to
  the right is one plate, and the piece of
  lithosphere with the arrows pointing to the left
  are another plate and both are going under
  beneath other plates.