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Abraham Ortellius
Dutch 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 Steno
He 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 Hutton
James 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 Holmes
Arthur 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 McKenzie
Theory 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 Hess
A 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 Wegener
German 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