Sea-Floor Spreading. Marie Tharp. Oceanographer First to map details of the ocean floor on a global scale Her observations became crucial to the eventual acceptance of the theories of plate tectonics and continental drift. Marie Tharp's "World Ocean Floor Map”. 1977. Seafloor Spreading.
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Mid Atlantic Ridge – Molten Material
100 Greatest Discoveries: Magnetic Reversals
As the rock cools, it records these magnetic reversals in the seafloor
Magnetization of the sea floor
As distance from the ridge increases, the age of the sea-floor increases
Turn and tell your neighbor the three pieces of evidence that support the theory of seafloor spreading
Sea Floor Spreading