Crust formation

Crust formation
  • Credit:

    Robert Simmon, NASA GSFC

New crust is formed along the mid-ocean ridges. Plumes of upwelling magma push the plates apart along these ridges at a rate of 1 - 5 cm per year. Underwater volcanoes--black smokers--are a common feature of the ridges.

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NASA - National Aeronautics and Space Administration