Because grit has a high __ __, it will settling more readily than organic matter in general

• A. Temperature
• B. Specific Gravity
• C. pH
• D. Viscosity

Answer: (B)

The key idea is that how fast solids settle in water is driven mainly by how dense they are compared with the water. Grit is inorganic and has a high density, giving it a high specific gravity. Because the density difference between grit and water is large, gravity pulls grit downward more strongly, so it settles quickly in a clarifier. Organic matter, on the other hand, is less dense and closer to water in density, so it doesn’t settle as rapidly. Temperature, pH, or viscosity can affect settling in other ways, but they’re not the primary reason grit drops out of suspension faster than organic matter.