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8th Grade Science

Plate Tectonic

Alfred Wegener proposed the theory of plate tectonics
tectonic plates pieces of the crust and the uppermost part of the mantle that cause changes in Earth's surface by their movement
plate tectonics describes large-scale movements of the Earth's Lithosphere
lithosophere made up of the crust and upper part of the mantle
asthenosphere beneath the lithosphere is part of the upper mantle and is so hot that it is part liquid
convection objects that are heated rise to the top. objects that are cooled sink, process by which heat is transferred by movement
Pangea an ancient super continent that broke up to make the seven continents we have today
evidence of Pangea groups of mountains formed around the same time on each side of the Atlantic Ocean, Mesosauraus fossils found in South America and Africa (fossil and mountain)
fault breaks in Earth's crust that form along plates
mid ocean ridges found huge underwater mountain ranges
sea-floor spreading hypothesis created by Harry Hess that gave more evidence to plate tectonic theory, molten rock form inside the earth rises through the cracks and forms new oceanic crust
convergent boundaries plate collide at boundary (mountains)
divergent boundaries plates move away from a boundary results in sea-floor spreading
transform boundary where plates slide past each other (earthquake)
subduction oceanic crust bends downward and sinks back into the mantle
plasticity the quality of being easily shaped or molded
Created by: SSC 8th LA