PPT-Sea Floor Spreading Chapter 4

Section 4 Standard S 61 Students know evidence from plate tectonics is derived from the fit of the continents and mid ocean ridges Vocabulary Midocean ridges Sonar Sea floor spreading Deep ocean trench. 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.. Chapter 14 Lesson 2. Mapping of the Ocean Floor. WWII played an important role in mapping of the ocean floor- Why?. They were able to observe and determine the depth of the ocean floor and the features of the ocean floor.. 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. What You Will Learn. 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. . Check your notes for . key ideas!. 1. Mid-Ocean Ridges.  . . An . underwater mountain . range stretching all over Earth.. . Scientists . used sonar to map the ocean . floor. Mapping the mid-ocean ridge made scientists more curious about what is happening . Video on Earth 1 million years from now. Theory of Continental Drift. Alfred Wegener . wrote . about his hypothesis of . continental . drift . in the 1900s. .. Continental drift.  is the hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations. . . 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 . Drifting Continents. Sea-Floor Spreading. The Theory of Plate Tectonics. Plate Tectonics. Piecing It All Together. The coastlines of some continents seem to fit. together like a jigsaw puzzle.. Drifting Continents. Subduction. Fun Fact: The tallest mountain in the world is…. Not Mt. Everest (29,028 ft). It’s Mauna Kea in Hawaii! (31,000 ft) . It doesn’t get as much attention because 2/3 of it is underwater. 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 . By: . Rishon. Pryce, Kaylee French. Period – 6. 09/21/15. Sonar.. The definition of sonar is:. Sonar (an acronym for sound navigation is a way to use sound . to navigate, . communicate . or detect objects on or under the surface of the water, such . Harrisburg, PA: Wild Resource Conservation Fund, 1995. Pennsylvania Endangered Plant Species State Rank: S1 (critically imperiled), Global Rank: G4 (apparently secure) T3 (vulnerabl Harrisburg PA Wild Resource Conservation Fund 1995 Pennsylvania Endangered Plant Species State Rank S1 critically imperiled Global Rank G4 apparently secure T3 vulnerable subspecies Sea Floor Spreading. A.  process in . which.  new ocean floor is created as molten material from the earth's mantle rises in . margins between.  plates or ridges and spreads .