Plate  - a rigid section of Earth's crust that moves very slowly. , Convergent boundary - A plate boundary where two plates move toward each other. , Divergent boundary - A plate boundary where two plates move away from each other. , Transform boundary - A plate boundary where two plates slide past each other in opposite directions. , Crust - A thin, rigid layer of rock that forms the Earth's surface. , Mantle - The solid layer below the crust that can behave like a liquid under some conditions. , Core - The center of the earth and is made up of iron and nickel. , Lithosphere - A rigid layer made up of the uppermost part of the mantle and the crust. Divided into plates. , Asthenosphere - The soft layer of mantle on which the tectonic plates move. , Density - The mass per unit volume - a measure of how tightly the particles of a substance are packed. , Convection current - A current caused by the rising of heated fluid and sinking of cooled fluid. , Outer core - the liquid layer of the Earth's core that lies beneath the mantle and surrounds the inner core. , Inner core - a dense ball of solid metal , Oceanic plates - Thin plates that form the ocean floor; more dense than continental plates. , Continental plates - plates below the continents., Plate tectonics - The theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle. , Mantle convection - A process by which heat from Earth's inner and outer cores is transferred through the mantle. , Plate boundaries  - At plate boundaries, Earth's curst is broken (fault) and rock slip past each other in one of 3 types of plate boundaries., volcano - a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust., earthquakes - A sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action. ,

Plate Tectonics

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