Sea-Floor Spreading Copy the following map of the ocean floor between continents. Label the parts of...
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Transcript of Sea-Floor Spreading Copy the following map of the ocean floor between continents. Label the parts of...
Sea-Floor Spreading
Copy the following map of the ocean floor between continents.
Label the parts of your map as we go along.
Sea-Floor Spreading
Mantle
Oceanic crust
Mid-ocean ridge
Convection currents in the asthenosphere push the crust apart.
Sea-Floor Spreading
Magma
Mantle
Oceanic crust
Mid-ocean ridge
Sea-Floor Spreading
Magma
Mantle
Oceanic crust
Sea-floor spreading
Mid-ocean ridge
Sea-floor spreading:
New magma is pushed up at the mid-ocean ridge, which pushes the older
rock away.
Sea-Floor Spreading
Magma
Mantle
Oceanic crust
Sea-floor spreading
Mid-ocean ridge
Newly formedoceanic crust
Sea-Floor Spreading
Magma
Mantle
Oceanic crust
Sea-floor spreading
Mid-ocean ridge
Newly formedoceanic crust
Old oceanic crust
Sea-Floor Spreading
Magma
Mantle
Oceanic crust
Sea-floor spreading
Mid-ocean ridge
Newly formedoceanic crust
Old oceanic crust
Tren
ch
Continentalcrust
Sea-Floor Spreading
Magma
Mantle
Oceanic crust
Sea-floor spreading
Mid-ocean ridge
Newly formedoceanic crust
Old oceanic crust
Tren
ch
Continentalcrust
Subduction: Old oceanic
crust is pushed under a continent causing the rock to melt back into
magma in the mantle.
Sea-Floor Spreading
Mid-ocean ridge
Molten material
Oceanic crust
Deep-ocean trenches
eruptsthrough
forms
subductedthroughforms
Sea-Floor Spreading
Mid-ocean ridge
Molten material
Oceanic crust
Deep-ocean trenches
eruptsthrough
forms
subductedthroughforms
Sea-Floor Spreading
Mid-ocean ridge
Molten material
Oceanic crust
Deep-ocean trenches
eruptsthrough
forms
subductedthroughforms
Sea-Floor Spreading
Mid-ocean ridge
Molten material
Oceanic crust
Deep-ocean trenches
eruptsthrough
forms
subductedthroughforms