What are Plate Tectonics? A theory that Earth’s Surface is divided into a few large plates that...
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What are Plate Tectonics? A theory that Earth’s Surface is divided into a few large plates that are constantly moving and changing shape. Geological evidence
What are Plate Tectonics? A theory that Earths Surface is
divided into a few large plates that are constantly moving and
changing shape. Geological evidence indicates that the face of
Earth's surface has changed significantly since its initial
formation.
Slide 3
What do Plate tectonics involve? Plate tectonics involves two
layers of Earth: the lithosphere and the asthenosphere The
lithosphere is divided into several major and minor tectonic
plates. The lithosphere is a rigid outer layer composed of the
crust and the uppermost mantle. The asthenosphere is an inner layer
about 200 kilometers thick located exclusively in the mantle.
Slide 4
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Fun Facts about Plate Tectonics Tectonic Plates move extremely
slow, at a rate of 12 centimeters per year. Heat from Earths
interior provides the energy necessary to move plates. Earth is the
only planet known to have plate tectonics. In 200 million years the
world will look much different then it does today. This is because
some of our present day continents maybe spilt apart and be
separated by new oceans.
Slide 6
Pangaea A supercontinent that broke apart 200 million years ago
to form the present continents.
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Plate Names The plate names are: North American Plate, Juan de
Fuca Plate, Pacific Plate, Caribbean Plate, Cocos Plate, Nazca
Plate, South American Plate, Scotia Plate, African Plate, Antarctic
Plate, Arabian Plate, Indian Plate, Eurasian Plate, Australian
Plate, Philippine Plate.
Slide 9
What are the Results of Plate Tectonics? Volcanoes Earthquakes
Faulting
Slide 10
Volcanoes Volcanoes occur along the earth's tectonic plates
where molten rock is forced upward from magma reservoirs deep in
the earth. A volcano is a mountain formed of lava and/or
tephra.
Slide 11
A Map of Volcanoes Around the World
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Earthquakes An earthquake happens when two plates rub together.
The plates travel in different directions and also at different
speeds. If one plate is forced underneath the other, pressure
builds up until the plates rip apart. This process causes the
ground to move which is known as an earthquake.
Slide 13
A Map of Earthquakes Around the World
Slide 14
Faulting A fault is a crack in the Earths crust. Faults are
typically associated with/form the boundaries between Earths
tectonic plates.
Slide 15
Types of Plate Boundaries Transform Divergent Convergent
Slide 16
Divergent Occur where plate motions cause plates to move apart.
For example, South America and Africa are on either side of the
Mid-Atlantic Ridge, a divergent plate boundary. Divergent plate
boundaries form a wide, steep-walled depression also know as a rift
valley.
Slide 17
Convergent At a convergent boundary, plates move toward each
other. Mountains are formed from convergent plate boundaries.
Slide 18
Transform A Transform Boundary occurs where two plates slide
past each other. Examples of Transform Boundaries are: The boundary
between the Pacific Plate and the Australian Plate, crossing New
Zealand The boundary between the Pacific Plate and the North
American Plate in California