The
Earth's crust is the outermost solid surface of the planet and is chemically
and mechanically different from the underlying mantle. The crust has been
produced chiefly by igneous processes in which magma cools and solidifies to
form solid rock. Beneath this lithosphere lies the mantle which is heated by
radioactive decay. This solid mantle exists in a state of rheic convection,
which process causes the lithospheric plates to move very slowly. The resulting
process is known as plate tectonics. Volcanoes result primarily from the
melting of subducted crust material or of rising mantle at mid-ocean ridges and
mantle plumes.
The
outer crust has rich diversity of mineral features and rock geometrics, due to
the compression of sedimentary layers, uplift, volcanism and diverse weathering
of surface soils. In addition to the mechanical forces, there are numerous
chemical processes which enrich the diversity of natural mineral occurrences. []
(Mac.Noumi
/ 5 February 2016).
Picture resource : National Geographic Document
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What is Litosphere ?
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