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.
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