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June 18, 2019

Saving A Bear From Certain Doom

Bears are huge mammals that belong to the family Ursidae. Bears are classified as caniforms, or dog like carnivores, with the pinnipeds being their closest living relatives. Although only eight species of bears are extant, they are widespread, appearing in a wide variety of habitats throughout the Northern Hemisphereand partially in the Southern Hemisphere. Bears are found on the continents of North America, South America, Europe, and Asia.

Common characteristics of modern bears include big bodies with stocky legs, long snouts, shaggy hair, plantigrade paws with five nonretractile claws, and short tails. While the polar bear is mostly carnivorous, and the giant panda feeds almost entirely on bamboo, the remaining six species are omnivorous with varied diets.

With the exception of courting individuals and mothers with their young, bears are typically solitary animals. They are generally diurnal, but may be active during the night or twilight, particularly around humans. Bears possess an excellent sense of smell and, despite their heavy build and awkward gait, are adept runners, climbers, and swimmers.

In autumn, some bear species forage large amounts of fermented fruits, which affects their behavior. Bears use shelters, such as caves and burrows, as their dens; most species occupy their dens during the winter for a long period (up to 100 days) of sleep similar to hibernation.

A Great Reason To Be Careful When You Are Trying To Rescue A Dog

Quicksand is a colloid hydrogel that consists of fine granular material (such as sand or silt), clay, and water.

Quicksand 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 upwards flowing water (as from an artesian spring).

In the case of upwards flowing water, seepage 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.

Liquefaction is a special case of quicksand. In this case, sudden earthquake forces immediately increases the pore pressure of shallow groundwater. The saturated liquefied soil loses strength, causing buildings or other objects on that surface to sink or fall over.

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