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Layers of Earth

Unit 4 Layers of the Earth

Inner core Ball of hot, solid metal at Earth’s center
Inner core Very high pressure causes it to be solid
Outer core Layer of liquid metal surrounding the inner core
Outer core Less pressure and lower temperature than inner core
Mantle Thickest layer of Earth made up of hot rock; less dense than core
Mantle Uppermost part of mantle is cool and rigid. Just below that, the rock is hot and soft enough to move like a thick paste.
Crust Thin layer of cool rock that surrounds Earth like an eggshell; 2 types
Continental crust Includes all continents (less dense; mostly composed of granite)
Oceanic crust Includes all the ocean floors(more dense; mostly composed of basalt)
Lithosphere Made up of the crust and the cool, rigid part of the upper mantle.
Lithosphere It is broken into tectonic plates and sits on top of the asthenosphere
Asthenosphere Layer of hotter, softer rock in Earth’s upper mantle; flows like tar
Relative position The location of something in comparison to its surroundings
Composition The makeup of a substance; the composition of carbon dioxide (CO2) is one carbon atom and 2 oxygen atoms
Density The amount of “stuff” present (mass) in a certain amount of space (volume)
Density Mass/Volume
Convection currents Hotter, less dense rock rises. Cooler, denser rock sinks back down, only to be heated and rise again
Convection heat transfer by the movement of fluids
Created by: mpmsscience