Saratov vs Boulder

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Saratov (UK: , US: ; Russian: Сара́тов, IPA: [sɐˈratəf] (listen)) is the largest city and administrative center of Saratov Oblast, Russia, and a major port on the Volga River located upstream (north) of Volgograd. As of the 2010 Census, Saratov had a population of 837,900, making it the 17th largest city in Russia by population. Saratov is 389 km from Volgograd, 442 km from Samara, and 858 km to the south-east of Moscow. The city stands near the site of Uvek, a city of the Golden Horde. The Tsar Feodor I of Russia likely developed Saratov as a fortress to secure Russia's southeastern border.

Saratov developed as a shipping port along the Volga, and it was historically important to the Volga Germans, who settled in large numbers in the city, before they were expelled after World War II. Saratov is home to a number of cultural and educational institutions, including the Saratov Drama Theater, Saratov Conservatory, Radishchev Art Museum, Saratov State Technical University, and Saratov State University.

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