Algiers vs Boulder

Informations

Algiers ( al-JEERZ; Arabic: الجزائر‎; Berber: Dzayer; French: Alger) is the capital and largest city of Algeria. The city's population at the 2008 Census was 2,988,145 and in 2011 was estimated to be around 3,500,000. An estimate puts the population of the larger metropolitan city to be around 5,000,000. Algiers is located on the Mediterranean Sea and at the north-central portion of Algeria.

Algiers is located on the west side of a bay of the Mediterranean Sea. The modern area of the town is built on the level ground by the seashore; the older part, the ancient city of the deys, climbs the steep hill behind the modern city and is crowned by the casbah or citadel, 122 metres (400 ft) above the sea. The casbah and the two quays form a triangle.

Source: Wikipedia

Informations

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