Material Coverage Guideline | Acapulco Rock & SoilOne cubic yard covers approximately 100 square feet to a depth of 3″. One 2 cubic foot bag (soils and mulches) covers approximately 8 square feet to a depth of 3″. One 75 pound bag (gravel, sand) covers approximately 4 square feet to a depth of 3″.روك رمل,روك رمل,Sand Types - SandatlasCoral sand, “Coral sand” has several meanings. Find out what it really is. Volcanic ash, Volcanic ash is a fine mixture of minerals and rock fragments thrown out of a volcano during exposive volcanic eruption. Glass sand, Traces of human activity are visible almost everywhere. Even sand may sometimes contain artificial.