Cetacea

Cetacea (/sᵻˈteɪʃə/), (from Latin cetus "large sea creature" and Greek ketos "sea-monster") are a widely distributed and diverse infraorder of carnivorous, aquatic, marine mammals. They comprise the families Balaenidae (right whales), Balaenoptera (rorqual), Eschrichtiidae (the gray whale), Delphinidae (oceanic dolphins), Monodontidae (Arctic whales), Phocoenidae (porpoises), Physeteridae (the sperm whale), Kogiidae (lesser sperm whales), Platanistidae (Old World river dolphins), Iniidae (New World river dolphins), Pontoporiidae (the La plata dolphin), and Ziphidae (beaked whales). There are currently 88 species of cetacean. While cetaceans were historically thought to have descended from mesonychids, molecular evidence supports them as descendants of Artiodactyla (even-toed ungulates). Cetaceans belong to the order Cetartiodactyla (derived from Cetacea and Artiodactyla), and their closest living relatives are hippopotamuses, having diverged about sixty million years ago.

Creative Commons

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High Force

High Force is a waterfall on the River Tees, near Middleton-in-Teesdale, Teesdale, County Durham, England. The waterfall is within the North Pennines Area of Outstanding Natural Beauty (AONB) and European Geopark.

Despite popular belief that it is the highest waterfall in England, at 71 feet (22 m), others have a longer fall: Cautley Spout, in Cumbria's Howgill Fells, is almost 590 feet (180 m) high, and Hardraw Force, in North Yorkshire, has an unbroken drop of 98 feet (30 m); whilst underground, on the flanks of Ingleborough, Fell Beck falls an unbroken 315 feet (96 m) down the Jib Tunnel of Gaping Gill Hole. However, High Force does have the largest volume of water falling over an unbroken drop when in full spate, thereby earning its Nordic name 'High Fosse'.

The whole of the River Tees plunges over a precipice (cliff edge which is almost vertical) in two stages. In former times flooding created two separate falls, but after the completion of Cow Green Reservoir in the upper Teesdale this seldom happens now except after a very heavy, continuous rainfall. In harsh winters the falls would freeze, creating cathedral-like ice formations.

Blue Planet

Blue Planet may refer to:

See also