Boulder vs Sioux Falls

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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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Sioux Falls () (Lakota: Íŋyaŋ Okábleča Otȟúŋwahe; "Stone Shatter City") is the most populous city in the U.S. state of South Dakota and the 140th-most populous city in the United States. It is the county seat of Minnehaha County and also extends into Lincoln County to the south, proximate with the Iowa state line. As of 2019, Sioux Falls had an estimated population of 183,793. The metropolitan population of 265,653 accounts for 29% of South Dakota's population.

Chartered in 1856 on the banks of the Big Sioux River, the city is situated in the rolling hills at the junction of interstates 29 and 90. According to Best Life magazine, Sioux Falls is the healthiest city in the United States and is often considered one of the healthiest cities in the US by many other organizations.

Source: Wikipedia