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The Amazing Snowball Phenomenon E-mail
(4 votes)
The Amazing Snowball Phenomenon

A snowball is a spherical object made from snow, usually created by scooping snow with the hands, and compacting it into a roughly fist-sized ball. The snowball is often used to engage in games, such as snowball fights. Snowball fights are usually light-hearted and involve throwing snowballs at one's friends or family. The pressure exerted by the hands on the snow is a determinant for the final result. Reduced pressure leads to a light and soft snowball. Compacting humid or "packy" snow, by applying a high pressure produces a harder snowball or iceball, which eventually can be considered harmful during a snowball fight.

A snow roller is a rare meteorological phenomenon in which large snowballs are formed naturally as chunks of snow are blown along the ground by wind, picking up material along the way, in much the same way that the large snowballs used in snowmen are made.

Unlike snowballs made by people, snow rollers are typically cylindrical in shape, and are often hollow since the inner layers, which are the first layers to form, are weak and thin compared to the outer layers and can easily be blown away, leaving what looks like a doughnut or Swiss roll. Snow rollers have been seen to grow as large as two feet in diameter.

Last Updated ( Tuesday, 03 December 2013 )
A River Of Fog Over Grand Canyon E-mail
(4 votes)
Friday morning, the gorges of the Grand Canyon were filled with fog in a rare temperature inversion
A temperature inversion happens when hot air high up acts as a seal to keep cold air pollution and fog trapped below
While inversions happen once or twice a year at the Grand Canyon, a full inversion is more unusual, happening closer to every 10 years

Those who decided to skip Black Friday shopping in favor of a trip to the Grand Canyon yesterday got to see the natural wonder from an extraordinary perspective.
Due to a rare weather phenomenon, the canyon's famous gorges were filled with a river of fog.
According to the national park's Facebook page, the fog was caused by something called a 'temperature inversion'. This happens when warm air acts as a lid to seal cool air near the ground. That means all pollution and fog is trapped and unable to rise.

A River Of Fog Over Grand Canyon

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