Transcript Seafloor Spreading

Seafloor Spreading
Mid-Ocean Ridge
Seafloor Spreading
Younger Rocks are found near the rift
and older rocks are found near the
continents
Seafloor Spreading: A High Speed
Animation
• http://education.sdsc.edu/optiputer/flash/sea
floorspread.htm
Every several thousand years the
Earth’s Magnetic Field flips
Magnetic Reversals
Great Discoveries: Harry Hess
• http://science.discovery.com/tvshows/greatest-discoveries/videos/100greatest-discoveries-sea-floor-spreading.htm
Subduction Zone- area where old crust
is pushed back into the crust
Subduction: So this is what
happened to the old oceanic rocks
• http://earthguide.ucsd.edu/eoc/teachers/t_te
ctonics/p_subduction.html
Trenches of the World
Mariana Trench
Lesson Learned
What is seafloor spreading and
how does this process help
support the theory of
continental drift?