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Transcript
Brainstorm…. What is the difference between a hypothesis, theory, and a Law? Framework! A Hypothesis is an educated guess based on research and observation. A Theory is a detailed explanation backed by evidence that withstands repeated testing. A Law is a detailed observation backed by evidence that withstands repeated testing. Continental Drift Theory The idea that all continents were once together in one landmass. Continents once existed as a supercontinent known as Pangaea. Evidence of Continental Drift • “Jigsaw” of continents. • Identical fossils are found across the oceans. • Rock Layers across oceans match up. • Identical climates across the oceans. Seafloor Spreading Mid Ocean Ridges are mountain ranges in the middle of the ocean. The seafloor spreads apart along both sides of a mid ocean ridge like a conveyer belt. Evidence of Seafloor Spreading Paleomagneitism is the study of Earth’s magnetic field shown in rocks. The age of the crust gets older the further away it is from a mid ocean ridge. Earth’s Plates Earth’s lithosphere is broken into separate sections called plates. These pieces of lithosphere float on the asthenosphere and interact with each other. Plate Tectonics Theory The theory that explains how Earth’s plates move and change shape is known as The Plate Tectonics Theory. Plate tectonics explains why seafloor spreading and continental drift occur.