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Transcript
The Story of the Discovery of Plate Tectonics All Continents had been joined together in a supercontinent, Pangaea and has since drifted apart In 1915 a German scientist named Alfred Wegener proposed hypothesis called CONTINENTAL DRIFT The same fossils were found on different continents This plant fossil Glossopteris was found on 5 different continents The same mountains were found on different continents Circle is where mountains split, half are found in East US, the other half in Europe Scratches from ice were found in deserts in India and Africa Scratches left by ice show that India and africa were much farther South on Globe WEGENER’S HYPOTHESIS WAS REJECTED BECAUSE HE COULDN”T PROVE WHY CONTINENTS MOVED! Mid-Ocean Ridges Or During World War II scientists began to use sonar to map the ocean floor Underwater volcanic mountain ranges Deep Ocean Trenches Or Deep holes where plates slide under eachother In 1963 Harry Hess created the idea of Sea-Floor Spreading New ocean floor forms at the mid-ocean ridges, slowly spreads out to form new ocean basins before sinking below lighter plates With Sonar Scientists Discovered: Other Observations *1 Youngest Rock was Found at the ridge and oldest the farthest away from the ridge *2 Basalt rock was found at the mid-ocean ridge, it comes from Volcanoes and makes the ocean floor of every ocean * 3 Ocean floor was found to be sinking below continents or other crust at the trenches… this process was named subduction WarmUp (3-19-13) • What is going to happen to all of our continents within the next 250 million years? – They will collide to form another supercontinent WarmUp (3-20-13) • Who developed the concept of Continental Drift and what was his evidence to support it? – Alfred Wegener: same fossils on different continents, and same rocks from mountains, and how continents fit together like a puzzle WarmUp (3-21-13) • Describe the process of sea-floor spreading. Agenda: 1.WarmUp 2.How It’s Made 3.Finish Poster 4.Watch Video WarmUp (3-25-13) • Name the three different types of plate boundaries. – Convergent boundary (plates collide with each other) – Divergent boundary (plates move away from each other) – Transform boundary (plates slide past each other) Agenda: 1.WarmUp 2.How It’s Made 3.Plate Tectonic Activity
