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8th Grade Science
Plate Tectonic
| Question | Answer |
|---|---|
| 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
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