Abraham OrtelliusDutch geographer and cartographer, and mapmaker
Theory:believed that America was “Torn Away From Europe and Africa” by earthquakes and floods.
Evidence: it wasn’t caused by earthquakes and floods- Alfred L. Wegener proved that is was the Continental Drift theory . The jigsaw fit of the continents.
Nicolaus StenoHe wondered how a solid object could be found inside another solid object.
Theory: rock strata and similar deposits were formed when particles in a fluid such as water fell to the bottom. This process would leave horizontal layers.
Evidence: assuming that all rocks and minerals had once been fluid he reasoned his theory. I agree because I think rocks do have layers inside.G
James HuttonJames Hutton (1726-1797)
Scottish geologists, chemist, naturalist
Theory: Believed that fusion of sediments arose by great heat from the lower region of the Earth’s crust
Evidence: He used Steno’s law of superposition to develop this theory.
Arthur HolmesArthur Holmes= 1890-1965 studied physics but switched to geology.
Theory: created a mechanism to prove wegener’s theory of continental drift which is what it is called when the continents move with the plates.
Evidence: He suggested the Earth’s mantle had contained convection cells that dissipated radiocative heat that may cause continental drift. I agree because i think that radioactive heat can cause the continents to move.
Dan McKenzieTheory of Plate Tectonics - The outer rigid layer of the earth (lithosphere) is divided into a few dozen plates that move across the earth’s surface relative to eachother . He wondered since he was young what happened to the the Continents and how they fit together like a puzzle. I agree because if the continents move then the lithosphere must be the only reason.
Harry HessA professor at Princeton University. His Theory was the Seafloor Spreading meaning When ocean crust is formed by volcanic activity and moves away from the ridge.Evidence: He wondered of this when he was looking at the ocean floor and noticed that they were young. He wrote a Report (History of Ocean Basins) to The Office of Naval Research about his discovery which was published in 1962. I agree because when lave dries, it becomes crust and they move away because of plate tectonics.
Alfred Lothar WegenerGerman meteorologist and geophysicist
Theory: Pangea Theory - Continental Drift- believed that the continents were once joined together and over time it drifted apart
Evidence: South America and Africa looks like jigsaw puzzles that was once snapped together