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The borders of the oceans are the limits of Earth 's oceanic waters. The definition and number of oceans can vary depending on the adopted criteria. The principal divisions (in descending order of area) of the five oceans are the Pacific Ocean, Atlantic Ocean, Indian Ocean, Southern (Antarctic) Ocean, and Arctic Ocean.
The mountain top removal method of coal mining, in which entire mountain tops are removed, is currently threatening vast areas and ecosystems of the Appalachian Mountain region. [31] The surface coal mining that started in the 1940s has significantly impacted the central Appalachian Mountains in Kentucky , Tennessee , Virginia and West Virginia.
With an estimated population of 580 million and an area of 24,709,000 km 2 (9,540,000 mi 2 ), the northernmost of the two continents of the Western Hemisphere [ 1] is bounded by the Pacific Ocean on the west; the Atlantic Ocean on the east; the Caribbean Sea on the south; and the Arctic Ocean on the north. The northern half of North America is ...
Natural border. The Oder, a natural border between Poland and Germany. A natural border is a border between states or their subdivisions which is concomitant with natural formations such as rivers or mountain ranges. The "doctrine of natural boundaries" developed in Western culture in the 18th century being based upon the "natural" ideas of ...
The Appalachian Mountains formed through a series of mountain-building events over the last 1.2 billion years: [ 4][ 5] The Grenville orogeny began 1250 million years ago (Ma) and lasted for 270 million years. The Taconic orogeny began 450 Ma and lasted for 10 million years. The Acadian orogeny began 375 Ma and lasted 50 million years.
Kogelberg Nature Reserve (Western Cape) Kogelberg Nature Reserve is a nature reserve of 3,000 ha (7,400 acres) comprising the Kogelberg Mountain Range, to the east of Cape Town, South Africa . With about 1600 plant species, it contains a floral diversity per unit area that is greater than anywhere else in the world. [ 1 ]
The Caucasus Mountains[ a] is a mountain range at the intersection of Asia and Europe. Stretching between the Black Sea and the Caspian Sea, they are surrounded by the Caucasus region and are home to Mount Elbrus, the highest peak in Europe at 5,642 metres (18,510 ft) above sea level. The Caucasus Mountains include the Greater Caucasus in the ...
Ireland is an island in Northern Europe in the north Atlantic Ocean. The island, of up to around 480 km (300 mi) north-south, and 275 km (171 mi) east-west, lies near the western edge of the European continental shelf, part of the Eurasian Plate. Its main geographical features include low central plains surrounded by coastal mountains.