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Unit 10: Layers of the Earth Review Vocabulary Element: A pure substance that cannot be separated into simpler substances by physical or chemical means Model: A limited representation of an object used to help us understand its structure or how it works Content Vocabulary Asthenosphere: The solid layer with plasticity in the upper mantle that is located just below the lithosphere; lithospheric plates "float" and move on this layer Crust: The thin solid outermost layer of Earth; made of less dense silicates and is continental (landmasses) or oceanic (ocean bottoms) Inner Core: The sphere of solid nickel and iron at the center of Earth; surrounded by the liquid outer core Lithosphere: The cool, rigid, outermost layer of Earth consists of the crust and the uppermost part of the mantle; pieces of this layer are called lithospheric plates Mantle: The solid layer of Earth between the crust and the core; made of dense silicates Outer Core: The outer shell of Earth's core; surrounds the inner core and is made of liquid nickel and iron Plasticity: The condition of material in the asthenosphere, existing in a solid state yet having the ability to flow without being a liquid