Transcript Tetonic Plate PPT

PLATE TECTONICS
Why the Earth is Like It Is
What Did
The Earth
Look Like
In The
Past?
Evidence to support Tectonic Theory
1.
2.
Continents coast lines fit together like a jig saw puzzle
same fossils found on different continents
Why Do Plates Move?
Plates are “pushed”
and “pulled” over the
surface of the Earth
due to unbalanced
forces.
REMEMBER
CONVECTION?
Convection currents
reach the surface,
plates are pushed
apart.
As the plates move
away from each
other, part of them
are pulled into the
Earth’s mantle.
Names of Plates
THREE TYPES OF MOVEMENT.
CONVERGENT - oceanic and continental plates
collide forcing the oceanic plate to slide beneath.
DIVERGENT - plates move away from each other,
where they diverge molten rock rises.
TRANSFORM - plates move horizontally past each
other.
Convergent Boundaries- Three Types
Continent/Continent
Ocean/Continent
Ocean/Ocean
Resulting landforms from
Convergence – Moving Together
Trenches
Structural
Mountains
Volcanoes
Divergent Plate boundary
Sea Floor Spreading forms ridges as the sea floor spreads apart
and lava rises
Rift Valley forms if the land is above water
TRANSFORM BOUNDARY
•
Transform boundaries occur in a few places to accommodate
lateral, or side to side motion, in which plates slide past one
another.
SAN ANDREAS FAULT
TKES Type Items
and Answer Analysis
As two continental plates move toward
each other, what landforms would you
expect to see?
Volcanoes
B. Cliffs
C. Mesas
D. Structural Mountains
A.
As two continental plates move toward
each other, what landforms would you
expect to see?
Volcanoes
Incorrect
These form at edges of plates or over
hot spots.
A.
As two continental plates move toward
each other, what landforms would you
expect to see?
Cliffs
Incorrect
These are erosional landforms or minor
uplift areas.
B.
As two continental plates move toward
each other, what landforms would you
expect to see?
Mesas
Incorrect
These are erosional landforms in a
desert.
C.
As two continental plates move toward
each other, what landforms would you
expect to see?
D.
Structural
Mountains –
correct Two continental
masses will push
into each other
and “crumple” the
edges to form
mountains.
Where would you find the newest
land on Earth?
A.
B.
C.
D.
In areas of continental convergence
In areas where two ocean plates come
together
In areas where plates are moving apart
In areas where two plates are sliding past each
other
Where would you find the newest
land on Earth?
In areas of continental convergence
Incorrect
Structural mountains would form here from
existing land.
A.
Where would you find the newest
land on Earth?
In areas where two ocean plates come
together
Incorrect
You would find trenches and subduction in this
area.
B.
Where would you find the newest
land on Earth?
In areas where two plates are sliding past each
other
Incorrect
You would find land movement, but not new
land being formed.
D.
Where would you find the newest
land on Earth?
In areas where plates are moving apart
Correct
When plates move apart, it is due to magma
reaching the surface. When magma cools, new
land is formed.
C.