Bamako vs Boulder

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Bamako (Bambara: ߓߡߊ߬ߞߐ߬ Bàmakɔ̌) is the capital and largest city of Mali, with a 2009 population of 1,810,366. In 2006, it had been estimated to be the fastest-growing town in Africa and sixth-fastest on the planet. It is located on the Niger River, near the rapids that divide the upper and middle Niger valleys in the southwestern part of the nation. Bamako is the country's administrative centre. The town proper is a cercle in its own right. Bamako's river port is situated in nearby Koulikoro, together with a significant regional trade and conference centre.

Bamako is the seventh-largest West African urban centre after Lagos, Abidjan, Kano, Ibadan, Dakar, and Accra. Locally manufactured goods include textiles, processed meat, and metal products as well as mining. Commercial fishing occurs on the Niger River. The title Bamako (ߓߡߊ߬ߞߐ߬‎ Bàmakɔ̌ in Bambara) comes in the Bambara word meaning"crocodile tail".

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