Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
PLATE TECTONICS & CONTINENTAL DRIFT A.CONTINENTAL DRIFT 1) Theory 1) An idea or observable fact (reason why) 2) Must have evidence 2) Continental Drift 2) “Theory” that continents (1st) were once together in one piece called PANGAEA Then they drifted apart (2nd) into the places they are today They are still moving today (3rd) B. SEA-FLOOR SPREADING: 1) Sea – Floor Spreading (1st) underground, hot liquid rock flows into the cracks in the ORIGINAL ocean floor (2nd) Next, Liquid rock hardens & creates NEW ocean floor (3rd) Last, the NEW ocean floor pushes the old floor outwards causing plates carrying continents to drift. C. PLATE TECTONICS: 1) Plate Tectonics 1) Theory that Earth’s crust is made out of invisible sections called “plates” Plates move in a slow, constant motion, driven by convection currents in the mantle 2) Pangaea 2) The shape of continents as 1 landmass – before they drifted. 3). Alfred Wegener 3) (1912) German scientist who created of the was a teacher & astronomer * meteorologist * geophysicist 4). Wegener’s Theory Continental Drift Theory 4) Continents were once Pangaea then drifted apart but are still moving EVIDENCE: Landforms, Fossils, Climate 5) Theory Rejected 5) Could not prove reasons for how or why continents had moved