PPT-Continental Drift How does it work?

The Theory of Plate Tectonics Earths Lithosphere is broken into many pieces called plates Plates mover very slowly only a few centimeters per year We measure that movement with GPS But how does it work. 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. Pangaea. Nearly 100 years ago, Alfred Wegener began an investigation that continues even today. . He wanted to know if Earth’s continents were in fixed (non-moving) positions.. He proposed that all the continents were once part of a supercontinent called Pangaea.. In 1812, Alfred Wegener presented his scientific theory called “Continental Drift”. It was based on his belief that the continents had drifted apart from one another.. Pangaea. Wegener ‘s hypothesis was that all the continents had once been joined together in a single landmass and have since drifted apart.. 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. . 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 . “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). Mass Extinctions, & . Adaptive Radiations. The rise and fall of dominant groups. Continental Drift. The continents are part of great plates of the Earth’s crust that essentially float on the underlying portion of the mantle. 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.