Earthquakes

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Earth
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http//www.youtube.com/watch?vOsKPNo_GSBkfeature
related
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CONTINENTAL SHELF PANGAEA THEORY OF
CONTINENTAL DRIFT TECTONIC PLATES CRUST MAN
TLE PLATE BOUNDARIES
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What Have Scientists Learned About the Earth and
its Interior?
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Earth

• Pangaea
• 200 million years ago, all the continents were
  together as a SUPER-continent

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Earth

• Alfred L. Wegener
• Created the theory of Continental Drift the
  movement of continents due to the floatation of
  the continents on the core (Magma) in 1912.

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Continental Drift
Alfred Wegener 1900s Continents were once a
single land mass that drifted apart. Continent
large land mass (6 or 7 depending on
p.o.v.) Fossils of the same plants and animals
are found on different continents Called this
supercontinent Pangea, Greek for all Earth 245
Million years ago
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(No Transcript)
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Moon Worship
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Sun Worship
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Native American Sun Dance
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Hawaiian Volcano Worship Goddess Pele
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How Plates Move
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Earth

• Continental Drift
• The slow movement of the plates that float on
  the Magma under the crust.

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Plate Tectonics Facts

• Greek tectonics of a builder
• Pieces of the lithosphere that move around
• Each plate has a name
• Fit together like jigsaw puzzles
• Float on top of the upper-mantle, called the
  asthenosphere

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Sea Floor Spreading
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Sea Floor Spreading

• Mid Ocean Ridges underwater mountain chains
  that run through the Earths Basins
• Magma rises to the surface and solidifies and new
  crust forms
• Older Crust is pushed
• farther away from the ridge

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Earth

• Magma
• Molten (melted) rock inside the Earth makes
  up all of the Earths outer core.

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Earths Layers
The Earth's rocky outer crust solidified billions
of years ago, soon after the Earth formed. This
crust is not a solid shell it is broken up into
huge, thick plates that drift atop the soft,
underlying mantle.
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The Crust

• Outermost layer
• 5 100 km thick, depending on where you are.

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The Mantle

• Layer of Earth between the crust and the core
• Contains most of the Earths mass
• Has more magnesium and less aluminum and silicon
  than the crust
• Is denser than the crust

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• http//www.youtube.com/watch?vQasi3k3Lji8

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http//www.youtube.com/watch?vYaf9oVff2CIfeature
relmfu
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Earth
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The Core

• Below the mantle and to the center of the Earth
• Believed to be mostly Iron, smaller amounts of
  Nickel, almost no Oxygen, Silicon, Aluminum, or
  Magnesium

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Earth

• Faults
• A break in rock along which rock slabs have
  moved.

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Earth

• Convergent Boundary
• Two plates come together, but one plate is
  forced underneath the other.

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Convergent Boundary Oceanic Continental
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Convergent Boundary Oceanic Oceanic
Note plates are reversed
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Convergent Boundary Indian and Eurasian Plates
Eurasian Plate
Indian Plate
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Ausable Chasm Adirondack Mts. NY
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Elephant Head Asuable Chasm
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Earth

• Divergent Boundary
• Plates move away from each other.

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Divergent Boundary - Oceanic
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Divergent Boundary Iceland
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Divergent Boundary Arabian and African Plates
Arabian Plate
Red Sea
African Plate
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Earth

• Transform-Fault Boundary
• Plates move past one another.

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Transform Boundary San Andreas Fault
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Can You Answer These?

• What are the three main layers of the Earth
• What was Pangea?
• What is Sea-Floor spreading?
• Name the three different types of plate
  boundaries and one location on Earth for each
  one.