A soil cannot be completely dissolved in a solvent like water because soil is made up of different particles such as sand, clay, silt, and organic matter. These materials do not dissolve, but they may suspend or settle in the liquid.A solvent (like water) can dissolve soluble substances (like salt or sugar).Soil contains insoluble particles, so instead of dissolving, it forms a mixture (mud or dirty water).Only some minerals or salts within the soil may dissolve, but the whole soil cannot.