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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
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