Sea-floor Spreading Section 1.4. Mid-Ocean Ridges In the mid 1900’s scientists discovered that the ocean floor is not flat. huge mountains deep trenches.

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Presentation transcript:

Sea-floor Spreading Section 1.4

Mid-Ocean Ridges In the mid 1900’s scientists discovered that the ocean floor is not flat. huge mountains deep trenches. like a zipper or baseball stitching

Mid-ocean ridge At the mid-ocean ridge new Earth crust is added.

Sea-floor spreading The sea floor spreads outward like a conveyor belt. Video

The sea floor spreads apart along both sides of the mid-ocean ridge. Sea-floor spreading

Evidence for Sea-floor spreading Molten Material - pillow like features that only form when molten material cools quickly VIDEO

Evidence for Sea-floor spreading Magnetic Stripes – When rocks form they freeze the magnetic orientation. The ocean surface is striped at regular intervals of opposite magnetism.

Evidence for Sea-floor spreading Core samples – Further away you get from the mid-ocean ridge the older the rocks become.

Subduction at Trenches Subduction - Process where ocean floor sinks beneath a continental crust. Deep ocean trenches are formed where oceanic crust meets the continental crust.