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  • The composition and properties of earth's interior identified by the behavior of seismic waves
  • An earthquake is a powerful releases of energy in the crust due to the movement of tectonic plates
  • By: Haley Gosselin, Rachana Kode, and Grace Gulczinski
  • Continental Crust is about 4x thicker, least dense, and found under tall mountains.
  • Oceanic Crust is thin, dense, and found under oceans. It is made up of Iron and Magnesium
  • Scientists study earthquake waves to determine layers of the earth by studying the way they move through earth to figure out the density and composition of them.
  • Scientists describe the mantle as “plastic” although the mantle rocks do not resemble everyday plastics.
  • The Earth is made of 4 main layers, Crust, Mantle, Outer Core, and Inner Core.
  • The asthenosphere: is the layer of the mantle that is a primary example of the term “plastic”.
  • The upper mantle: Hotter that the asthenosphere but does not flow due to high presure
  • The uppermost mantle: is part of the lithosphere with the crust.
  • The Crust is the thin, brittle, rocky outer layer of Earth. It is part of the lithosphere along the uppermost mantle. No one has ever drilled deeper than 23.5 miles.
  • The mantle is the thick, middle layer immediately below the crust and is made up of magnesium and iron silicates.
  • Scientists also divide the 2,230 km thick on average mantle into four layers, based upon how the layers react to forces pushing or pulling on them.
  • Lower Mantle: Hotter than Upper Mantle, and does not flow due to high pressure
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