Sea-Floor Spreading Copy the following map of the ocean floor between continents. Label the parts of your map as we go along.

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Presentation transcript:

Sea-Floor Spreading Copy the following map of the ocean floor between continents. Label the parts of your map as we go along.

Convection currents in the asthenosphere push the crust apart. Sea-Floor Spreading Mid-ocean ridge Oceanic crust Mantle Convection currents in the asthenosphere push the crust apart.

Sea-Floor Spreading Mid-ocean ridge Oceanic crust Mantle Magma

Sea-Floor Spreading Mid-ocean ridge Sea-floor spreading Oceanic crust Mantle Sea-floor spreading: New magma is pushed up at the mid-ocean ridge, which pushes the older rock away. Magma

Newly formed oceanic crust Sea-Floor Spreading Newly formed oceanic crust Mid-ocean ridge Sea-floor spreading Oceanic crust Mantle Magma

Newly formed oceanic crust Sea-Floor Spreading Newly formed oceanic crust Old oceanic crust Mid-ocean ridge Sea-floor spreading Oceanic crust Mantle Magma

Newly formed oceanic crust Sea-Floor Spreading Newly formed oceanic crust Old oceanic crust Mid-ocean ridge Continental crust Sea-floor spreading Trench Oceanic crust Mantle Magma

Newly formed oceanic crust Sea-Floor Spreading Newly formed oceanic crust Old oceanic crust Mid-ocean ridge Continental crust Sea-floor spreading Trench Oceanic crust Mantle Subduction: Old oceanic crust is pushed under a continent causing the rock to melt back into magma in the mantle. Magma

Sea-Floor Spreading Oceanic crust Mid-ocean ridge Deep-ocean trenches forms subducted through Mid-ocean ridge Deep-ocean trenches Molten material forms erupts through

Sea-Floor Spreading Oceanic crust Mid-ocean ridge Deep-ocean trenches forms subducted through Mid-ocean ridge Deep-ocean trenches Molten material forms erupts through

Sea-Floor Spreading Oceanic crust Mid-ocean ridge Deep-ocean trenches forms subducted through Mid-ocean ridge Deep-ocean trenches Molten material forms erupts through

Sea-Floor Spreading Oceanic crust Mid-ocean ridge Deep-ocean trenches forms subducted through Mid-ocean ridge Deep-ocean trenches Molten material forms erupts through