Fill in the blanks:
(a) The method of separating seeds of paddy from its stalks is called ………….
(b) When milk, cooled after boiling, is poured onto a piece of cloth the cream (malai) is left behind on it. This process of separating cream from milk is an example of ………….
(c) Salt is obtained from seawater by the process of ………….
(d) Impurities settled at the bottom when muddy water was kept overnight in a bucket. The clear water was then poured off from the top. The process of separation used in this example is called …………
