Polar Regions: Human Impacts (Our Fragile Planet) by Dana Desonie

By Dana Desonie

There is not any position extra distant than the Arctic and Antarctic, yet their remoteness has now not stored them remoted: toxins published in constructed lands trip on air and water currents into the polar areas, the ozone gap has widened over Antarctica, and worldwide warming is inflicting its maximum harm within the world's iciest locales. in addition to an figuring out of ways human actions are altering the polar areas has come an appreciation in their value in international weather, organic productiveness, and biodiversity. "Polar areas" is an important new ebook that explains what number scientists are supplying forewarning of the adjustments that may come to the full planet if society maintains on its present trajectory. that includes full-color images and illustrations, sidebars, feedback for extra interpreting, and websites, this e-book palms readers with the data essential to take a stand in maintaining our fragile planet.

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Icefish have other adaptations for gathering oxygen such as large gills, skin that contains large capillaries to increase oxygen absorption (instead of scales), larger hearts, and larger blood volumes. The basic cell structures of Antarctic fish are also adapted to the cold. For example, microtubules, which play an important role in cell life in the polar seas Antarctic Seals The five species of seals and one species of sea lion that live on Antarctic ice are listed below. 5 m) in length with a weight of 5,000 pounds 2,270 kg).

In addition to its size, Antarctica has the distinction of being the coldest, driest place on Earth. Antarctica is covered by the Antarctic ice sheet, which, at 7 mil-­ lion cubic miles (30 million cubic km), contains about 90% of the world’s total ice. If this ice sheet were to melt, the seas would rise by over 200 feet (60 m). This enormously thick ice sheet gives Antarctica the highest average elevation of any continent: 7,544 feet (2,300 m) above sea level. The average ice thickness is 6,500 feet (2,000 m).

The average ice thickness is 6,500 feet (2,000 m). The thickest layer is found at Wilkes Land, at 15,669 feet (4,776 m) thick. Antarctic ice is so deep in places that scientists using advanced geophysical equipment have discovered mountain ranges and other geologic features buried beneath the ice sheet. The 1,900 ­mile (3,000 km) long Transantarctic Mountains split the Antarctic continent into eastern and western sides. East Antarctica, the larger side, is dominated by a thick ice plateau that lies atop the continental mainland.

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