Seafloor Spreading

what are Mid-Ocean Ridges?

• Mid-ocean ridges form long chains of mountains that rise up from the ocean floor.(pg 98
• scientists found that the seams formed mountain ranges that ran along the middle of some ocean floors.

what is Sea-floor Spreading?

• Sea-floor spreading begins at a mid-ocean ridge,which forms along a crack in the ocean crust.
• sea-floor spreading adds more crust to the ocean floor.At the same time,older-strips of rock move outward from either side of the ridge.
• (pg ~100)

REFERENCES

• Thornton,K,Buckley,D,Miller,Z,padilla,M.J ,&Waysession,M.E.(2013).Interactive Earth Science.Glenview,illinois: Person Education,Inc.

what happens at Deep-Ocean Trenches?

• In a process taking tens of millions of years,part of the ocean floor sinks back into the mantle at deep-ocean trenches.
• As subduction occurs,crust closer to a mid-ocean ridge moves away from the ridge and toward a deep-ocean trench.

THE END!!!