Seventy per cent of the earth's surface
is covered with seas and oceans made up of water
with a saline content as high as three percent.
During the successive geological epochs from the
birth of our planet some four hundred and fifty
million years ago, sea salt has constantly been
undergoing diversification into other foims in a
variety of environments, such as solid rock-salt
strata, subterranean brine deposits, terrestrial
salt-marshes and salt lakes.
From preiiistoric times on, the technical problems
of extracting and processing this valuable mineral
have continued to test the ingenuity of the human
race.
Sources
of Salt
At present, the total supply of salt produced
throughout the world amounts to an annual average
of one hundred and eighty million tons. Sea salt
accounts for approximately one fourth of this total.
Salt
producing Areas
 British
salt
Polish
salt
Mali
salt
The
Salt Lake at Uyuni,Bolivia
Natural
salt-fields:Mexico
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