Boulder vs Karlsruhe

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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

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Karlsruhe (, also US: , German: [ˈkaʁlsˌʁuːə] (listen); formerly spelled Carlsruhe) is the second-largest city of the German federal state of Baden-Württemberg after its capital of Stuttgart, and its 313,092 inhabitants make it the 21st largest city of Germany. On the right bank of the Rhine, the city lies near the French-German border, between the Mannheim/Ludwigshafen conurbation to the north, and the Strasbourg/Kehl conurbation to the south. It is the largest city of Baden, a historic region named after Hohenbaden Castle in the city of Baden-Baden. Karlsruhe is also the largest city in the South Franconian dialect area (transitional dialects between Central and Upper German), the only other larger city in that area being Heilbronn. The city is the seat of the Federal Constitutional Court (Bundesverfassungsgericht), as well as of the Federal Court of Justice (Bundesgerichtshof) and the Public Prosecutor General of the Federal Court of Justice (Generalbundesanwalt beim Bundesgerichtshof).

Karlsruhe was the capital of the Margraviate of Baden-Durlach (Durlach: 1565–1718; Karlsruhe: 1718–1771), the Margraviate of Baden (1771–1803), the Electorate of Baden (1803–1806), the Grand Duchy of Baden (1806–1918), and the Republic of Baden (1918–1945). Its most remarkable building is Karlsruhe Palace, which was built in 1715. There are nine institutions of higher education in the city, most notably the Karlsruhe Institute of Technology (Karlsruher Institut für Technologie). Karlsruhe/Baden-Baden Airport (Flughafen Karlsruhe/Baden-Baden) is the second-busiest airport of Baden-Württemberg after Stuttgart Airport, and the 17th-busiest airport of Germany. In 2019 the UNESCO announced that Karlsruhe will join its network of "Creative Cities" as "City of Media Arts".

Source: Wikipedia