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There are 5 layers of the Earth:
CRUST
MOHO - Mohorovičić discontinuity
MANTLE
OUTER CORE
INNER CORE
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There are two different types of crust.
Continental crust which is what the continents
are and what they are moving on. The crust is
made of rock - Granite
Oceanic Crust which is what is below the
oceans, the oceans are on top of the oceanic
crust. The crust is made of rock - Basalt
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Continental crust is thicker and oceanic crust
BUT oceanic crust is denser than continental
crust.
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The Earth’s plates move because of convection
currents in the mantle.
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The plates are made up of the oceanic and
continental crust on the planet.
The plates are broken into different sizes and
shapes.
The plates move around the planet because of
convection currents in the mantle
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The plates move in three major directions with
variations in each type. The directions are:
Convergent
Divergent
Transform
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Convergent means come together or converge
in one spot.
The plates are moving towards each other until
they meet.
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Oceanic vs Oceanic – you get underwater
mountains
Continental vs Continental you get mountains
Oceanic vs Continental – SUBDUCTION!
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Subduction – the Oceanic plate goes below the
continental plate due to the density of the
Oceanic plate
Mountains
Volcano
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NOT THE BOOK/MOVIE!!
The plates are moving away from each other.
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Two types of divergent plates
Oceanic vs oceanic – sea floor spreading and
mid ocean ridges .
Continental vs continental - rift valleys
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Two plates rub against each other.