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The Earth is not just a solid rock, rotating on its
axis. Scientists have determined that the inside of the Earth is
composed of different layers, the core, mantle, and crust. The
interaction of the crust and the mantle causes many of our deep
earthquakes. The upper mantle contains an area called the asthenosphere
that is partially molten. The area above the asthenosphere is called the
lithosphere. The lithosphere is "floating" of the
asthenosphere in large blocks which act together. These
"blocks" are what scientists refer to as plates. The plates
move slowly due to several reasons including convection, gravity,
rotation, and other forces.
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