QUICKSAND - definizione. Che cos'è QUICKSAND
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Cosa (chi) è QUICKSAND - definizione

COLLOID HYDROGEL CONSISTING OF FINE GRANULAR MATERIAL, CLAY, AND WATER
Quick sand; Sinking Sand
  • Thames]]
  • Quicksand and a warning sign about it at a gravel quarry in England
  • Lower King]] Bridge, Western Australia
  • A group of hikers encountering quicksand on the banks of the [[Paria River]], Utah

quicksand         
(quicksands)
1.
Quicksand is deep, wet sand that you sink into if you try to walk on it.
The sandbank was uncertain, like quicksand under his feet.
N-UNCOUNT: also N in pl
2.
You can refer to a situation as quicksand when you want to suggest that it is dangerous or difficult to escape from, or does not provide a strong basis for what you are doing.
The research seemed founded on quicksand.
N-UNCOUNT: also N in pl
quicksand         
n.
Syrtis.
quicksand         
¦ noun (also quicksands) loose wet sand that sucks in anything resting on it.

Wikipedia

Quicksand

Quicksand, also known as sinking sand, is a colloid consisting of fine granular material (such as sand, silt or clay) and water. It forms in saturated loose sand when the sand is suddenly agitated. When water in the sand cannot escape, it creates a liquefied soil that loses strength and cannot support weight. Quicksand can form in standing water or in upward flowing water (as from an artesian spring). In the case of upward flowing water, forces oppose the force of gravity and suspend the soil particles.

The saturated sediment may appear quite solid until a sudden change in pressure or shock initiates liquefaction. This causes the sand to form a suspension and lose strength. The cushioning of water gives quicksand, and other liquefied sediments, a spongy, fluid-like texture. Objects in liquefied sand sink to the level at which the weight of the object is equal to the weight of the displaced soil/water mix and the submerged object floats due to its buoyancy.

Soil liquefaction may occur in partially saturated soil when it is shaken by an earthquake or similar forces. The movement combined with an increase in pore pressure (of groundwater) leads to the loss of particle cohesion, causing buildings or other objects on that surface to sink.

Esempi dal corpus di testo per QUICKSAND
1. It was virtually like quicksand," said police Capt.
2. It was virtually like quicksand," said Police Capt.
3. To a hapless individual who finds himself drowning in a quicksand of mud.
4. Now nobody I know has ever seen any quicksand in this country, but so committed to a total rendering of human experience is the guide that we have this entry: Quicksand – what to do if you are trapped.
5. For nearly 2 years the US military has been sinking into the quicksand of Iraq.