One method used to purify water is
(17) The coagulation and settling of
(NO RESPONSE REQUIRED)
(18) By adding certain chemicals to
to precipitate or coagulate and
settle to the bottom (chemical
List two methods used to purify
(19) Distillation requires a "still,"
whereby water is changed to its
gaseous form, separating it from
Two methods used to purify water are:
is by ______________________.
(20) List three methods used to purify