Quicksand.

The article provides information on quicksand defined as a non-Newtonian liquid with sand and water or sand and air. Topics discussed the role of density in the tendency of a relaxed body to float in a quicksand, factors that lead to the creation of quicksand such as movement of water on the beach at low tide and seismic activity, and the similarity between the slurry created by quicksand and wet concrete.