Fill in the blanks with appropriate words:
(i) Small pieces of stone can be removed from rice by __________.
(ii) ___________ are obtained from stalks by threshing.
(iii) Husk from wheat flour is generally removed by __________.
(iv) The process of settling of heavier particles is called __________.
(iv) Filtration is helpful in separating an insoluble __________ from a __________.