Plate Boundaries

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Direction of movement for a CONVERGENT boundary: (toward / away / slide past)
moves TOWARD each other
Direction of movement for a DIVERGENT boundary: (toward / away / slide past)
moves AWAY from each other
Direction of movement for a TRANSFORM boundary: (toward / away / slides)
slide past each other
All of these formations can occur at a CONVERGENT boundary EXCEPT _________ and _________. (mountain, volcano, earthquake, ridge, rift, trench)
ridges and rifts
All of these formations can occur at a DIVERGENT boundary EXCEPT _________ and _________. (mountain, volcano, earthquake, ridge, rift, trench)
mountains and trenches
Which of these formations (1) can occur at a TRANSFORM boundary? (mountain, volcano, earthquake, ridge, rift, trench)
earthquakes
How is new seafloor material in Earth's crust formed?
magma rises to fill spaces where plates have pulled away from one another
How is seafloor material destroyed or "recycled"?
rock material is subducted (sinks) into trenches
Rocks found on opposite sides of the Mid-Atlantic Ridge prove the theory of Plate Tectonics because they are (older / newer).
the rocks farther and farther from the ridge are older
During convection in the BOTTOM of the lower mantle, rock (heats up / cools down).
heats up
During convection in the BOTTOM of the lower mantle, rock becomes (more / less) dense.
less - this is why it will then rise
During convection in the BOTTOM of the lower mantle, rock (rises / falls).
rises
During convection in the TOP of the lower mantle, rock (heats up / cools down).
cools down
During convection in the TOP of the lower mantle, rock becomes (more / less) dense.
more - this is why it begins to then sink
During convection in the TOP of the lower mantle, rock (rises / falls).
falls
Plate Tectonics
The theory that the earth is broken into plates and are in motion due to convection currents in the asthenosphere (upper mantle)
Alfred Wegener
Proposed the continental drift theory in the 1900s
Pangaea or Pangea
term for the super continent which contained all the plates together
Crust
The thin and solid outermost layer of the Earth above the mantle
Lithosphere
The solid, outer layer of the Earth that consists of the the crust and the rigid upper part of the mantle
Asthenosphere
The soft layer of the mantle on which the tectonic plates move
Transform Boundary
The boundary between tectonic plates that are sliding past each other horizontally
Continental Drift
The hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations
Sea-floor spreading
The process by which new oceanic crust forms as magma rises towards the surface and solidifies
Convergent Boundary
The boundary formed by the collision of two plates
Divergent Boundary
The boundary between two tectonic plates that are moving away from each other
rift valley
long, narrow depression formed at divergent boundaries
subduction
process in which two plates collide and the denser ocean plate descends below the other
convection current
this type of energy transfer is believed to drive plate movement
Evidence of Continental Drift
Fossils, climate, rocks, glacial deposits
trench
extremely deep areas in the ocean that are created by a subducting plate
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