1. The document discusses different methods of separating mixtures including filtration, winnowing, sieving, and picking.
2. Filtration involves using a filter to separate solid substances from liquids. Sieving and sifting are used to separate solid mixtures where one component has smaller particles than the other.
3. Winnowing separates grains from chaff by throwing materials into the air and allowing the wind to blow away lighter particles. Picking can separate mixtures where the components are large enough to be identified and gathered by hand.