Download Sea Floor Spreading - Dallastown Area School District

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Sea Floor Spreading
Mid Ocean Ridge
• The undersea mountain
chain where new oceanic
crust is produced
Mid-Ocean Ridge (photos)
More Evidence for SFS
1. Age of rocks
• Young rocks = close to ridge
• Old rocks = far from ridge
2. Magnetic Stripes
• Iron fragments are reversed in a
striped pattern parallel with the
• The process of oceanic crust
sinking beneath another
piece of crust and melting
into the mantle
Putting it all together . . .