Landforms - The natural features that make up earth's surface, Earthquakes - Release of energy through earth's crust due to changes taking place beneath., Shield - the flat rocky base created when an ancient mountain region has worn away., Plateau - a high flat region that has been lifted by movement of earth's surface., Plain - a large flat to gently rolling region, Valley - the area of land between 2 mountains, Magma - extremely hot fluid or semi fluid material under earth's crust, Lava - molten rock flowing from a volcano, Volcano - an opening in earth's crust from which molten rock or magma escapes to reach the surface., Plate tectonics - the theory that earth's surface is made up of rigid plates that are pushed by forces inside the planet., Lithosphere - the outer solid layer of earths made up of moving plates., Convection flow - a circular motion created when warmer material rises and draws down colder material which replaces it., Asthenosphere - a soft weak layer undo the lithosphere upon which the tectonic plates move, Divergent boundaries - a place where 2 plates of the lithosphere move away from each other. In the ocean, Transform boundaries - a place where side by side plates grind past each other. Found a lot in San Andreas California, Convergent boundaries - a place where 2 plates of the lithosphere come together, Weathering - the breaking down of rocks by physical or chemical processes, Erosion - the wearing away of earth's surface by wind water or glacial action, Ring of fire - a region where the pacific plate meets the eurasian, australian and american plates., Epicenter - is the place on earth's surface directly above where the main shock occurs,

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