Freezing is an alternate method, based on the different freezing points of fresh and salt water.
(Freezing; is; an alternate method, based on the different freezing points of fresh and salt water) (an alternate method; based; on the different freezing points of fresh and salt water)
Freezing an alternate method
is based
an alternate method, based on the different freezing points of fresh and salt water
on the different freezing points of fresh and salt water