PPT-NOW, you will learn • How the continental drift hypothesis was developed

About evidence for plate movement from the sea floor How scientists developed the theory of plate tectonics Continents change their position over time Page 14 Key Concept BEFORE you learned . Definition. The very slow movement of the continental plates on the surface of the Earth due to tectonic activity through geological time.. What is the evidence of Continental Drift?. Continental Fit. Continental Drift. Objectives. Summarize Wegner’s hypothesis of continental drift. Describe the process of sea floor spreading. Identify how paleomagnetism provides support for the idea of sea floor spreading. . Continents . (pages. . 136–140). Continental. . Drift. . (pages. . 137–139). Key. Concept:. . Alfred. . Wegener’s. . hypothesis. was that. . all the continents were once joined together in a. and . Seafloor Spreading . Notes. Part 1. Alfred Wegener. and the. Continental Drift. hypothesis. Up until the early 1900s, long-held tradition in the earth sciences stated that continents have remained in fixed positions throughout geologic time. . Chapter. 12-1. Pan-. gaea. . “. all. - earth. ” . Note: Our world today is actually a 2’nd or 3’rd generation “super continent” or “. pangea. ” !!!. . Alfred Wegener . Who proposed the theory called “Continental Drift”?. Alfred Wegener. What is Continental Drift?. A hypothesis that continents had drift or move apart.. What is Pangaea?. the “supercontinent”. Name all 7 continents. North America. South America. Africa. Antarctic. Australia. Europe. Asia. Pangaea. Pangaea is the name for the original super continent. Pan .  all. G. aea  Earth. The continents looked like they might fit together like puzzle pieces. Warm Up. 1. What is the thickest layer of the Earth? . 2. What is the thinnest layer of the Earth?. 3. What happens to temperature as the depth within the Earth increases? . 4. What happens to the density as the depth within the Earth increases? . Unit 12.1. These observations lead him to come up with the . ___________________________. A very long time ago (~200 million years) the continents were joined together in a . ___________________. called . Describe Wegener’s hypothesis of continental drift. . Explain . how sea-floor spreading provides a way for continents to move. . Describe . how new oceanic lithosphere forms at mid-ocean ridges. . Explain . 1. What is Wegener’s hypothesis?. That all of the continents were once joined together is a single landmass and have since drifted apart.. 2. Wegener’s idea that the continents slowly moved over Earth’s surface became known as….. “All the earth”. Pangaea split apart and the different land masses, or continents, drifted to their current locations on the globe. http://www.learner.org/interactives/dynamicearth/drift3.html. Alfred Wegener (1880-1930). The World. ALFRED WEGENER. THEORY OF CONTINENTAL DRIFT. Found evidence for PANGAEA and proposed the theory of continental drift.. Continental Drift Theory. Theory that continents were once part of a single landmass 200 million years ago that broke apart and have moved to their present locations. . http://www.sciencechannel.com/tv-shows/greatest-discoveries/videos/100-greatest-discoveries-continental-drift.htm. Restless Continents-pg. 248. Wegener proposed idea of . continental drift.. . -. C.