Boulder vs Qom

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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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Qom (Persian: قم‎ [ɢom] (listen)) is the seventh largest metropolis and also the seventh largest city in Iran. Qom is the capital of Qom Province. It is located 140 km (87 mi) to the south of Tehran. At the 2016 census, its population was 1,201,158. It is situated on the banks of the Qom River. Qom is considered holy in Shi'a Islam, as it is the site of the shrine of Fatimah bint Musa, sister of Imam Ali ibn Musa Rida (Persian: Imam Reza; 789–816). The city is the largest center for Shi'a scholarship in the world, and is a significant destination of pilgrimage, with around twenty million pilgrims visiting the city every year, the majority being Iranians but also other Shi'a Muslims from all around the world.

Qom is also famous for a Persian brittle toffee known as sohan (Persian: سوهان), considered a souvenir of the city and sold by 2,000 to 2,500 "sohan" shops. Qom has developed into a lively industrial centre owing in part to its proximity to Tehran. It is a regional centre for the distribution of petroleum and petroleum products, and a natural gas pipeline from Bandar Anzali and Tehran and a crude oil pipeline from Tehran run through Qom to the Abadan refinery on the Persian Gulf. Qom gained additional prosperity when oil was discovered at Sarajeh near the city in 1956 and a large refinery was built between Qom and Tehran.

Source: Wikipedia