When you move rock and dirt the only thing that stays constant is:

When you move rock and dirt the only thing that stays constant is:

• A. Unit weight of soil
• B. Dry weight of the soil
• C. Moisture content of soil
• D. Dry unit weight of the soil

Answer: (B)

When moving rock and dirt, the amount of solid material you have doesn’t change, only its moisture and packing do. The dry weight is the weight of those solids alone, without any water, so as long as you don’t lose or gain solids, that dry mass stays the same. Wet unit weight, moisture content, and dry unit weight can all vary because water content changes with weather, drainage, and how tightly the soil is compacted. In short, the solid material’s mass is conserved during earthmoving, making the dry weight the constant factor.

When moving rock and dirt, the amount of solid material you have doesn’t change, only its moisture and packing do. The dry weight is the weight of those solids alone, without any water, so as long as you don’t lose or gain solids, that dry mass stays the same. Wet unit weight, moisture content, and dry unit weight can all vary because water content changes with weather, drainage, and how tightly the soil is compacted. In short, the solid material’s mass is conserved during earthmoving, making the dry weight the constant factor.