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Sea ice - Video Learning - WizScience.com

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"Sea ice" is frozen seawater. Because ice is less dense than water, it floats on the ocean's surface . Sea ice covers about 7% of the Earth’s surface and about 12% of the world’s oceans. In the North, it is found in the Arctic Ocean, in areas just below it and in other cold oceans, seas and gulfs; in the Antarctic, it occurs in various areas around Antarctica . Much of the world's sea ice is enclosed within the polar ice packs in the Earth's polar regions: the Arctic ice pack of the Arctic Ocean and the Antarctic ice pack of the Southern Ocean. Polar packs undergo a significant yearly cycling in surface extent , a natural process upon which depends the Arctic ecology, including the ocean's ecosystems. Due to the action of winds, currents and temperature fluctuations, sea ice is very dynamic, leading to a wide variety of ice types and features. Sea ice may be contrasted with icebergs, which are chunks of ice shelves or glaciers that calve into the ocean. Depending on location, sea ice expanses may also incorporate icebergs. Sea ice does not simply grow and melt. During its lifespan, it is very dynamic. Due to the combined action of winds, currents and air temperature fluctuations, sea ice expanses typically undergo a significant amount of deformation. Sea ice is classified according to whether or not it is able to drift, and according to its age. Sea ice can be classified according to whether or not it is attached to the shoreline . If attached, it is called landfast ice, or more often, fast ice . Alternatively, and unlike fast ice, drift ice occurs further offshore in very wide areas, and encompasses ice that is free to move with currents and winds. The physical boundary between fast ice and drift ice is the "fast ice boundary". The drift ice zone may be further divided into a "shear zone", a "marginal ice zone" and a "central pack". Drift ice consists of "floes", individual pieces of sea ice 20 m or more across. There are names for various floe sizes: "small" – 20 m to 100 m; "medium" – 100 m to 500 m; "big" – 500 m to 2000 m; "vast" – 2 km to 10 km; and "giant" – more than 10 km. The term "pack ice" is used either as a synonym to "drift ice", or to designate drift ice zone in which the floes are densely packed. The overall sea ice cover is termed the "ice canopy" . Wiz Science™ is "the" learning channel for children and all ages. SUBSCRIBE TODAY Disclaimer: This video is for your information only. The author or publisher does not guarantee the accuracy of the content presented in this video. USE AT YOUR OWN RISK. Background Music: "The Place Inside" by Silent Partner (royalty-free) from YouTube Audio Library. This video uses material/images from https://en.wikipedia.org/wiki/Sea+ice, which is released under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . This video is licensed under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . To reuse/adapt the content in your own work, you must comply with the license terms.
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