Question

in the mixture of sand and water (dirty water), a clear water can be separated from the sand by ----
evaporation
condensation
filtering
fermentation

Explanation:

To separate clear water from sand in dirty water, we use filtering. Filtering works by passing the mixture through a filter medium (like filter paper) that traps the solid sand particles while allowing the liquid water to pass through. Evaporation is for separating dissolved solids from liquids, condensation is part of the water cycle (gas to liquid), and fermentation is a biological process for producing substances like alcohol or acids, so they don't apply here.

Answer:

filtering