Ice that is found at sea may be in the form of sea ice, pack ice, or icebergs. The term that collectively describes all of the parts of the Earth's surface where water is in frozen form is the cryosphere. Ice is an important component of the global climate, particularly in regard to the water cycle. Glaciers and snowpacks are an important storage mechanism for fresh water; over time, they may sublimate or melt. Snowmelt is often an important source of seasonal fresh water.
Rime is a type of ice formed on cold objects when drops of water crystallize on them. This can be observed in foggy weather, when the temperature drops during the night. Soft rime contains a high proportion of trapped air, making it appear white rather than transparent, and giving it a density about one quarter of that of pure ice. Hard rime is comparatively denser.
Aufeis is layered ice that forms in Arctic and subarctic stream valleys. Ice, frozen in the stream bed, blocks normal groundwater discharge, and causes the local water table to rise, resulting in water discharge on top of the frozen layer. This water then freezes, causing the water table to rise further and repeat the cycle. The result is a stratified ice deposit, often several meters thick.
Ice can also form icicles, similar to stalactites in appearance, or stalagmite-like forms as water drips and re-freezes.
Clathrate hydrates are forms of ice that contain gas molecules trapped within its crystal lattice.
Pancake ice is a formation of ice generally created in areas with less calm conditions.
Candle Ice is a form of Rotten Ice that develops in columns perpendicular to the surface of a lake.
Ice discs are circular formations of ice surrounded by water in a river.
The World Meteorological Organization defines several kinds of ice depending on origin, size, shape, influence and so on.
Read more about this topic: Ice
Other articles related to "formation":
... As formed the Mobile Division was made up of the 1st and 2nd Light Armoured Brigades, the 1st Tank Brigade, artillery, engineers and signals ... Its paper strength was 620 armoured fighting vehicles, but seven eighths of these were reconnaissance vehicles, and of those some were being simulated by trucks ...
... This provisional government with Dupont de l'Eure as its president, consisted of Lamartine for foreign affairs, Crémieux for justice, Ledru-Rollin for the interior, Carnot for public instruction, Goudchaux for finance, Arago for the navy, and Burdeau for war ... Garnier-Pagès was mayor of Paris ...
... The standard Gibbs free energy of formation of a compound is the change of Gibbs free energy that accompanies the formation of 1 mole of that substance from its component ... (oxygen gas, graphite, etc.) have 0 standard Gibbs free energy change of formation, as there is no change involved ...
... Formation of the primitive streak is reliant upon nodal signaling within the cells contributing to the primitive streak and BMP4 signaling from the extraembryonic tissue ... the site of gastrulation and initiate germ layer formation ... will ingress and migrate during the process of gastrulation and germ layer formation ...
Famous quotes containing the word formation:
“Those who were skillful in Anatomy among the Ancients, concluded from the outward and inward Make of an Human Body, that it was the Work of a Being transcendently Wise and Powerful. As the World grew more enlightened in this Art, their Discoveries gave them fresh Opportunities of admiring the Conduct of Providence in the Formation of an Human Body.”
—Joseph Addison (16721719)
“I want you to consider this distinction as you go forward in life. Being male is not enough; being a man is a right to be earned and an honor to be cherished. I cannot tell you how to earn that right or deserve that honor. . . but I can tell you that the formation of your manhood must be a conscious act governed by the highest vision of the man you want to be.”
—Kent Nerburn (20th century)
“Out of my discomforts, which were small enough, grew one thing for which I have all my life been gratefulthe formation of fixed habits of work.”
—Elizabeth Stuart Phelps (18441911)