Seafloor spreading

Mid-ocean ridge

• (Mid ocean ridges is kind of mountain range.) "99 p"
• (The mountain ranges rises up above water.) "99 p"
• (steep-sided valley splits the tops of some of the oceans ridges)"99 p"

How sea-floor spreading affects Earths crust

• (sea-floor ridges continualy adding new materials to the ocean floors.) "100 p"
• (sea-floor spreading adds more crust to the ocean floor.) "100 p"
• (older strips of rock moves outward from either side of the ridges.) "100 p"

deep sea trenches

• (deep ocean trenches sink in the process of subduction.) "102 p"
• (when the ocean floor sinks the density change) "102 p"

References

• Thorton,K.,Buckley,D.,Miller,Z.,Padilla,M.J.,& Wysession,M.E(2013)Interactive Earth Science. Glenview Illinois: Pearson Education, Inc.