ÜSea water is about 3% salts, mostly NaCl, with a little CaCO3 and CaSO4.
ÜAs sea water evaporates, the salts precipitate when different fractions have
evaporated:
CaSO4 when 50%
evaporated
CaCO3 when 80%
evaporated
ÜIf sea water has evaporated to:
Below 10%, get a triplet
layer of salts
10-20%, get a doublet
layer
20-50%, get only a singlet
layer