Quicksand appears to be muddy and squishy on the surface where
a person or animal or any object can sink in and disappear. The
person seems to be sucked into a hole. The reason the quicksand
acts that way is because it is a thixotropy. It refers to a gel-like
substance that becomes more fluid or less firm as it is disturbed
by shaking. When someone thrashes or moves around in a quicksand,
that person sinks in faster because the wiggling causes the sand
to liquify.
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