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MS-ESS2-3 Earth’s Systems-Plate Tectonics PowerPoint
MAIN IDEA-Distribution of fossils and rocks, continental shapes, and seafloor structures provide evidence of past plate motions. Tectonic processes continually generate new ocean sea floor at ridges and destroy old sea floor at trenches. Maps of ancient land and water patterns, based on investigations of rocks and fossils, make clear how Earth’s plates have moved great distances, collided, and spread apart. Plate Tectonics-a theory explaining the structure of the earth's crust and many associated phenomena as resulting from the interaction of rigid lithospheric plates that move slowly over the underlying mantle. Fossil-the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock. Continental Shelf-the part of a continent that is submerged in relatively shallow sea. Ocean Ridge-an underwater mountain system formed by plate tectonics. It consists of various mountains linked in chains, typically having a valley known as a rift running along its spine. Fracture Zone-a long, narrow rift on the ocean floor, separating areas of differing depth. Where such a zone crosses a mid-ocean ridge, it displaces the ridge by faulting. lOceanic Trenches-topographic depressions of the sea floor, relatively narrow in width, but very long. These oceanographic features are the deepest parts of the ocean floor. Their movement and effects at plate boundaries are explained e.g. earthquakes, volcanoes, mountain building, ocean ridges/trenches, subduction (part of the rock cycle). Produce changes on a planetary scale over millions of years. Evidence can explain large scale features of the Earth’s surface and how they change. Subduction-A geological process that takes place at convergent boundaries of tectonic plates where one plate moves under another and is forced or sinks due to gravity into the mantle. Regions of different continents that share similar fossils and similar rocks suggest that, in the geologic past, those sections of continent were once attached and have since separated. The shapes of continents, which roughly fit together (like a puzzle) suggest that those land masses were once joined and have since separated. The separation of continents by the sequential formation of new seafloor at the center of the ocean is inferred by age patterns in oceanic crust that increase in age from the center of the ocean to the edges of the ocean. The distribution of seafloor structures (volcanic ridges at the centers of oceans, trenches at the edges of continents) combined with the patterns of ages of rocks at the seafloor (youngest at the ridge, oldest ages at the trenches) supports the interpretation that new crust continues to form and that the oldest crust is being destroyed at seafloor trenches. Fossils, rocks, continental shapes, and seafloor structures provide evidence of past plate motions.
Can be edited for younger or older students. Check out MS-ESS2-3 Earth’s Systems-Plate Tectonics Worksheet to check for understanding on TPT.