Meaning of quicksand: water-saturated, sandy soil in a floating or mobile state under certain groundwater seepage pressure. The sand in the desert area that is not fixed and often flows with the wind. Ancient reference to the desert regions of northwest China.

Fluid sand is the most ingenious mechanism devised by nature, which may be hidden in the riverside coast or even in the neighbor's backyard, quietly waiting for people to approach, so that people in and out of the dilemma.

In 1692 A.D., Jamaica's Port Royale was the scene of an earthquake that liquefied the soil and created quicksand, resulting in the disappearance of one-third of the city and the deaths of 2,000 people. There have also been stories of quicksand trapping people in the seemingly calm North Sea of England and the beautiful but dangerous Alaskan fjords.

But most people have never seen quicksand, much less seen someone fall into it or experienced it. People's image of quicksand is largely based on various movies, which portray scenes in which quicksand is a large monster that can suck people into a bottomless pit. Once people are trapped in it, they often can't pull themselves out, and their companions can only watch as the trapped person is swallowed up by the sand in a matter of moments.

Scientific Principle:

After repeated experiments, scientific researchers led by Bourne found that it takes days to make sand as sticky as toffee, but it's easy to make it lose its stickiness, as long as you apply the right amount of pressure to its surface. Once the surface of the quicksand is disturbed by movement, it quickly "liquefies," with the top layer of sand becoming fluffy and the shallow layer quickly running downward.

This migratory movement makes the objects moving on top of the quicksand sink, however, as the depth of sinking increases, the sand and clay from the upper layers falling to the bottom layer below the migratory movement gradually coalesce to create a thick layer of sediment, so that the viscosity of the sand increases rapidly, preventing the objects from sinking further.