Here's a breakdown:
* Early 20th century: Ideas about continental drift, proposed by Alfred Wegener in 1912, laid the groundwork. However, his theory lacked a plausible mechanism for the continents' movement.
* Mid-20th century: Evidence from seafloor spreading, paleomagnetism, and earthquake patterns began to accumulate.
* 1960s: The theory of plate tectonics was formulated, integrating these observations and explaining continental drift through the movement of Earth's lithospheric plates.
Key Developments:
* 1960s: Harry Hess proposed the idea of seafloor spreading.
* 1962: Vine and Matthews discovered magnetic stripes on the ocean floor, providing strong evidence for seafloor spreading.
* 1965: J. Tuzo Wilson proposed the concept of transform faults, which connect spreading centers and explain the offset of mid-ocean ridges.
* 1968: The first complete model of plate tectonics was published by a group of scientists, including W. Jason Morgan, Dan McKenzie, and Xavier Le Pichon.
So, while the theory of plate tectonics built upon earlier ideas, it was truly solidified and widely accepted in the 1960s.
