Brussels vs Boulder

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The City of Brussels (French: Ville de Bruxelles [vil də bʁysɛl] or alternatively Bruxelles-Ville [bʁysɛl vil]; Dutch: Stad Brussel [stɑd ˈbrʏsəl] or Brussel-Stad) is the largest municipality and historic centre of the Brussels-Capital Region, and the capital of Belgium. Besides the strict centre, in addition, it covers the immediate northern outskirts where it borders municipalities in Flanders. It is the administrative center of the European Union, thus often dubbed, along with the area, the EU's capital city. The City of Brussels is a municipality composed of the central historic city and certain additional regions within the greater Brussels-Capital Region, namely Haren, Laeken and Neder-Over-Heembeek to the north, as well as Avenue Louise/Louizalaan and the Bois de la Cambre/Ter Kamerenbos park to the south.

As of 1 January 2017, the City of Brussels had a whole population of 176,545. The entire area is 32.61 km2 (12.59 sq mi) which gives a population density of 5,475 inhabitants per square kilometre (14,180/sq mi). As of 2007, there were approximately 50,000 registered non-Belgians in the City of Brussels. In common with all of Brussels' municipalities, it's legally bilingual (French--Dutch).

Source: Wikipedia

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In geology, a boulder is a rock fragment with size greater than 256 millimetres (10.1 in) in diameter. Smaller pieces are called cobbles and pebbles. While a boulder may be small enough to move or roll manually, others are extremely massive. In common usage, a boulder is too large for a person to move. Smaller boulders are usually just called rocks (American English) or stones (In British English a rock is larger than a boulder). The word boulder is short for boulder stone, from Middle English bulderston or Swedish bullersten.In places covered by ice sheets during Ice Ages, such as Scandinavia, northern North America, and Siberia, glacial erratics are common. Erratics are boulders picked up by ice sheets during their advance, and deposited when they melt.

They are called "erratic" because they typically are of a different rock type than the bedrock on which they are deposited. One of them is used as the pedestal of the Bronze Horseman in Saint Petersburg, Russia. Some noted rock formations involve giant boulders exposed by erosion, such as the Devil's Marbles in Australia's Northern Territory, the Horeke basalts in New Zealand, where an entire valley contains only boulders, and The Baths on the island of Virgin Gorda in the British Virgin Islands. Boulder-sized clasts are found in some sedimentary rocks, such as coarse conglomerate and boulder clay. The climbing of large boulders is called bouldering.

Source: Wikipedia