What did Alfred Wegener and what did he theorize?

Answer 1

Alfred Wegener was a German scientist who was the first one to discover the continental drift. In 1915, Alfred Wegener, suggested that about 300 million years ago all of Earth's land masses, which were in constant motion, collided to form one supercontinent. He called it Pangaea , which means " all land". About 200 million years ago, the supercontinent of Pangaea started to break up. The pieces drifted in different directions to their present positions. Wegener had 4 proofs for his theory of continental drift. Most scientists did not accept the theory because Wegener could not explain what force was powerful enough to move continents. Wegener tried to prove his theory: He saw the jigsaw fit between South America and Africa. He found fossils of the same plants and animals on both continents. He believed that they exist in both places only if the continents were once joined together. It was not until the 1960's that the technology existed to develop Wegener's theory further. By 1968, a new and more complete theory known as plate tectonics had been developed.