Kids experiencing quicksand at Mont-Saint-Michel, an island in Normandy, France. Therefore, thrashing around will indeed cause you to sink and become more engulfed. The higher the stress applied to the material, the more liquid it becomes. Is this a liquid or a solid? It’s a thixotropic solution.) (Add water to corn starch while slowly stirring to make it just liquid.
Clay deposits can exhibit thixotropic behavior and lose their shear strength suddenly due to vibration. Silty areas can more easily liquify than sand. Natural areas of quicksand can be found where there is upward flowing water, like at the outflow of spring, or near rivers or on beaches where water is present just below the surface. Buildings constructed on wet ground can collapse during the shaking when the shear strength is suddenly reduced and the particles flow past each other. Vibration, such as from an earthquake, can trigger a complex process called liquefaction. The sand suddenly loses stability and collapses. The sand may look stable and can hold light weight but a force such as a foot bearing down disrupts the balance. Additional water reduces friction, the particles separate and the mixture flows. A moderate amount of water and sand results in packed grains that are held fairly tightly together and can sustain weight.
Think about how you moisten sand at the beach to build up a sand castle. “Lighning sand” from the The Princess Bride (1987) Sediment + water
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