Who gave the theory of Seafloor Spreading?

The correct answer is option 3, i.e. Harry Hess.

• Harry Hess proposed the theory of SeaFloor Spreading in 1961.
• He stated that new lava pushes out the plates from the mid-oceanic ridge.
• Paleomagnetic studies of the ocean floor reveal that there is an intense volcanic eruption and the huge amount of lava is coming out along the mid-Atlantic ridges.
• The equidistant rock formation has similar age, magnetic properties and chemical compositions.
• Rocks which are closer to the mid-oceanic ridges are young having normal polarity.
• Oceanic crust is much younger than continental crust.
• The ocean floor is very thin.
• He said that the new plate is created at the divergent boundary and the older plate is destroyed at the convergent boundary.