Friday, August 23, 2013

Quicksands: the trap of nature

SCIENCEThe land is generally associated with a safe place, a space in which while we are there, everything is fine, no danger. Examples are the sayings "keep our feet on the earth", "land in sight!", "The plane touched down." But what nobody told or had in mind is that not all land is a guarantee of stability. Various physical effects combine to transform what looks like a safe portion of sustenance into a dangerous trap and exit difficult.
Quicksand colloid is a hydrogel consisting of a mixture of fine-grained materials (such as sand), clay and water.
The quicksand when they are disturbed by an outside agent, usually appears as a solid, but the slightest change in the stresses in the sand causes a sudden decrease in its viscosity. After the initial disturbance, as may be the fact that a person to walk on them, water and sand are separated, forming sand sedimented dense regions, this is due to the formation of areas consisting of large volumes of matter with different size , so that the viscosity of the quicksand appears suddenly increased. There is a false belief that attributes the quicksand to desert areas, but the truth is that they are not present in any desert mainly by the lack of
To move in the quicksand should apply enough pressure in the sand condensed and enter the required amount of water to be able to liquefy. The force required to get out of them is too important to move one foot in the quicksand at a speed of one centimeter per second requires the same force that you have to invest to build a midsize car!.
Quicksand can be found in inland along rivers, near lakes, or in marshes, or near the region costa.Una notoriously famous for its quicksands is Morecambe Bay, England. As the bay is wide and shallow, a person caught in quicksand would be exposed to the danger of the tide.
Quicksand has different forms. Some seem mud, others have the appearance of water with soil, leaves or debris on it and some have a combination of sand and soil in a large puddle of water.
In the movies has become popular to see a person completely swallowed by quicksand, causing it to die. The reality is different, as scientists have shown that the shifting sands have little depth and consistency fully capable of holding a floating weight, making it impossible for someone to die sucked into them. The real danger lies in not being able to leave them and starvation, heat or exhaustion, or indeed drowned in the water to climb a nearby tide. Furthermore, it is a complete lie the classic way to save with a stick or a tree, as there are many ways to get out of quicksand.

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