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

Published byDwight Jacobs Modified over 9 years ago

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Presentation on theme: "Sea-Floor Spreading Copy the following map of the ocean floor between continents. Label the parts of your map as we go along."— Presentation transcript:

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

2 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.

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

4 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

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

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

7 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

8 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

9 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

10 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

11 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

12 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

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