Scientists
Alfred Wegener
Alfred Lothar Wegener, a German scientist, geophysicist, and meteorologist, lived from November 1, 1880 to November 1930. His famous theory was the Continental Drift, proposed in 1912. This hypothesis was not accepted until the 1950s, when they had strong support for this theory.
Wegener always thought that the reason the continents all fit together like a giant jigsaw puzzle was not just a coincidence. He hypothesized they all fit together in the past and referred to this "Super Continent," as Pangaea which means all land. Wegener thinks that more than 200 million years ago all the continents were together as one large land mass and has slowly drifted to where they are now.
Wegener always thought that the reason the continents all fit together like a giant jigsaw puzzle was not just a coincidence. He hypothesized they all fit together in the past and referred to this "Super Continent," as Pangaea which means all land. Wegener thinks that more than 200 million years ago all the continents were together as one large land mass and has slowly drifted to where they are now.
Harry Hess
Harry Hess suggested the theory of seafloor spreading. Hess proposed that the hotter material that is less dense will move toward the surface at mid ocean ridges.