Sifted is a process used to separate materials of different sizes or weights. It is commonly used in the food industry to separate grain from chaff, and in the mining industry to separate ore from waste. SIEVED is a similar process, but it uses a sieve or screen to separate materials. RIDDLED is a process that involves shaking or vibrating a material to separate out the larger pieces. WINNOWED is a process that uses air currents to separate lighter materials from heavier ones. All three processes are used to separate materials of different sizes or weights, and all three can be used to describe the term 'sifted'.