Download Earth`s Interior Processes

Earth’s Interior Processes
Plate Techtonics
•  The theory that the earth’s lithosphere
(crust and top of mantle) called plates
move slowly on top of the earth’s
asthenosphere (upper mantle).
•  Alfred Wegener – proposed that the
earth’s continents were once joined in a
single supercontinent (known as Pangea)
and broke apart into the continents
–  This process was known as continental drift
Mantle Convection
•  Hot rock from the middle of the earth rises
and as it cools moves back to the middle
of the earth to be reheated.
–  This is what causes the plates to move!
http://bprc.osu.edu/
education/rr/
plate_tectonics/
mantle_convection_
cell.gif
http://www.youtube.com/watch?v=p0dWF_3PYh4
Seafloor spreading
•  The process by which new oceanic crust is
created at mid ocean ridges as older crust
moves away
–  Magma pushes out of mid ocean ridges
moving old crust farther away
h"p://www.fofweb.com/ac/velink2.asp?
ItemID=WE40&SID=5&iPin= FMG027123&SingleRecord=True. http://www.youtube.com/watch?v=YIAXiE8RedA
Plate Boundaries
•  Divergent Boundaries – plates moving
away from each other
•  Convergent Bounderies – plates colliding;
often one plate is subducted
•  Transform Boundaries – plates slide past
each other
http://www.youtube.com/watch?
v=7gnAtsFoIdw
Drawing bounderies
•  Page 682
Plate Boundaries
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Along these boundaries ……
Mountains
Volcanoes
Earthquakes
Valleys
Fault lines
Sink holes
http://www.youtube.com/watch?v=AhG4gXrnVM&feature=fvw