Mussel
Flowing sand - a mass of loose sandy rocks saturated with water and exhibiting high mobility (floatability) under certain hydrodynamic conditions. True flowing sands are sands containing hydrophilic colloids, while false flowing sands do not contain colloidal particles.
Source: ORDER of the Ministry of Energy of Russia No. 175, State Mining Supervision of Russia No. 107 dated 27.06.1997
"ON APPROVING THE CHARTER OF THE MILITARY MINE RESCUE UNIT (VMSC)"
(together with "CHARTER OF THE MILITARY MINE RESCUE UNIT (VMSC) ON ORGANIZATION AND CONDUCT OF MINE RESCUE OPERATIONS AT ENTERPRISES OF COAL AND SHALE INDUSTRY")