Coal is
a black or brownish-black sedimentary
rock that
can be burned for fuel and used to
generate electricity. Coal
is the largest source of energy for generating electricity in the
world. Coal is an abundant natural resource that can be used as a
source of energy, as a chemical source from which numerous
synthetic compounds (e.g.,
dyes, oils, waxes, pharmaceuticals, and pesticides) can be
derived, and in the production of coke for metallurgical
processes.
