ppt

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Movement of Plates
and Formation of
folds and faults

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Alfred Wegener proposed
Continental Drift Theory in the
early 1900s. The land masses were
once united into a single
supercontinent named Pangaea. He
said that Pangaea broke up long ago
and that continents then moved to
their current position.

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The
continents
fit
together!

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EVIDENCES
OF
CONTINENTAL
DRIFT
1. Continents fit together like
puzzle pieces.
2. Similar geological structures and
rocks on either side of the
Atlantic ocean.
3. Similar fossils can be found on
different continents.
4. Climatic evidences.

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Tension – occurs when the
plates are pulled apart
causing either an elongation
or breakage in the crust
Examples: volcanic islands,
mid-oceanic ridge are formed

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Compression – occurs when
the plates are pushed
toward each other causing
them to crash.
Examples: mountains,
earthquake are formed, rocks
bend or break

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Folding – occurs when the
earth’s crust bends away
from a flat surface.
Types: Anticline- upward bend

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Anticline:

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Syncline
Downward bend

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Faulting –
happens when
Earth’s crust
completely
breaks and slides
pass each other.
It causes
Earthquakes to
occur

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Types of Plate Boundaries
1.Convergent plate boundary –
 2 plates crush into each
other and crumples.
 2 plates move toward each
other.
 Oceanic – oceanic
 Oceanic – continental

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Trenches,
volcanoes,
mountains
Examples

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Divergent plate boundary
 Occurs when
plates pull apart
from each
other.
 2 plates move
away from each
other.

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Transform plate boundary
 2 plates move or slide
in opposite direction
also called as “ strike
slip fault boundary”
Example: formation of
faults

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Types of plates
Boundary
1. Convergent
plate Boundary

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Types of plates
Boundary
2. Divergent
plate Boundary

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Types of plates
Boundary
3. Transform
plate Boundary