Mud

Some mud.

Mud is a liquid or semi-liquid mixture of water and some combination of soil, silt, and clay. Ancient mud deposits harden over geological time to siltstone or solid mudrock lutites. When geological deposits of mud are formed in estuaries the resultant layers are termed bay muds.

Mud, in the construction industry, is wet plaster, stucco, cement or other similar substance. Mud is closely related to slurry and sediment.