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Transcript
Seafloor spreading Concept review • Boundaries between lithospheric plates – Convergent – Divergent – Transform • Seafloor spreading: divergent boundaries • Earth’s magnetic field Seafloor Spreading http://espanol.video.yahoo.com/watch/159557 0/5390151 Earth’s Magnetic Field • • • • Liquid iron in core moves as Earth rotates Field reverses (N – S) Magnetic minerals in lava align with the field Paleomagnetism: study of past magnetism, recorded in rocks Seafloor Spreading Demonstration • • • • Create new seafloor Start with normal polarity magnetic field Reverse the polarity; repeat; change duration Finish: – Tape paper down center – Label: rift zone, N (normal) polarity, S (reverse polarity), oldest rocks, youngest rocks • Students to present their seafloor diagrams
