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Plate Tectonics
“Building Up and Tearing Down”
Tectonic Plates
Brittle vs. Ductile
Ductile:
Relatively flexible.
–Ex: A denim pencil
–Ex: Silly Putty
Brittle:
easily.
Breaks relatively
–Ex: A wooden pencil
–Ex: Peanut Brittle (Yum)
Continental vs. Oceanic Plates
 Less
Dense
 Thicker (35-70
km)
 Brittle (Not
“Stretchy”)
 Much Older
(3.7 billion
years old)
 More
Dense
 Thinner (5-10
km)
 Ductile (A Bit
“Stretchy”)
 Much Younger
(144 million
years old)
Page 173
Transform (Fault)
Plate Boundaries
Convergent
Plate Boundaries
Plate Movement Observations
Wrinkled Edges
Both Go Up
Black Goes Down
Divergent Plate Boundaries
Divergent
Plate
Boundaries
are where
the plates
are moving
(Drifting)
apart.
Mid-Ocean Ridge
Mid-Ocean Ridge
Iceland
Rift Valley
Great Rift Valley
Convergent Plate Boundaries
Convergent
Plate
Boundaries
are where
the plates
are colliding
(coming
together).
Subduction Zone
Crater Lake (Near Bend, OR)
Folded Mountains
Himalayan Mountains
Island Arcs
Aleutian Islands
(AK)
Transform (Fault) Plate
Boundaries
 Transform
(Fault) Plate
Boundaries are
where the
plates are
sliding past
each other.
(Like two trains
going past each
other, I know
it’s a stretch).
San Andreas Fault
Mid-Atlantic Ridge
(Along the Edges)
New Zealand. . . Maybe?
(Alpine Fault)
Earth’s Tectonic Plates
Plate Movement
Plate Movement
Plate Movement (ScienceSaurus 185)
Plate Movement Model Lab
Big Idea (Inquiry 15.1)
 Plate
tectonics lead to formation
of land and landforms as well as
the destruction of crust.
 It is important to know which
landforms are created at which
types of plate boundaries. There
are some interactive websites
that are helpful with this topic.