MESOSPHERE, the region of the earth's atmosphere above the stratosphere and below the thermosphere, CONVECTIONOFMANTLE, the slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior of the Earth to the surface., GRAVITY, the force that attracts a body toward the center of the earth, or toward any other physical body having mas, ATHENOSPHERE, the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur., CORE, the central region of the Earth, OUTERCORE, layer that lies above Earth's solid inner core and below its mantle., INNERCORE, the Earth's innermost part, MANTLE, a layer between the crust and the outer core, LITHOSPHERE, the rigid outer part of the earth, consisting of the crust and upper mantle., CONVECTION, the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat., MAGNETOSPHERE, the region surrounding the earth or another astronomical body in which its magnetic field is the predominant effective magnetic field., CONDUCTION, the process by which heat or electricity is directly transmitted through a substance, RADIOACTIVEDECAY, the process by which an unstable atomic nucleus loses energy, OCEANICCRUST, the uppermost layer of the oceanic portion of a tectonic plate, CRUST, a thin shell on the outside of Earth, accounting for less than 1% of Earth's volume.

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