All articles starting with O

Ordos Basin

The Ordos Basin is a large sedimentary basin in the western North China Block, China, with a depositional history from the Mesoproterozoic to the Quaternary.

Ordos City (鄂尔多斯市) is a prefecture-level city in southwest Inner Mongolia, China, a major coal and natural gas producer whose Kangbashi new district was famously labeled a "ghost city" by Al Jazeera and Time in 2009–2010.

Ordos Desert

The Ordos Desert (鄂尔多斯沙漠) is the collective name for the sandy deserts of the Ordos Plateau in Inner Mongolia, China, in the great bend of the Yellow River.

Ordos Power Qipanjing power station

Ordos Power Qipanjing power station is a coal-fired power station in Qipanjing Town, Ordos, Inner Mongolia, China, built from 2003 as the captive power supply for the Qipanjing Industrial Park.

Ordos-Anping-Cangzhou Gas Pipeline

The Ordos-Anping-Cangzhou Gas Pipeline (鄂安沧输气管道) is a Sinopec natural gas transmission system in northern China, 2,293 kilometers long with a capacity of 30 billion cubic meters per year, first commissioned in November 2018.

Ordovician

Ordovician Period, second Paleozoic period, 485.4–443.8 Ma (ICS), named by Lapworth; seven GSSP-defined stages, Great Ordovician Biodiversification Event, high CO2 with cooling, and the Hirnantian glaciation and mass extinction.

Ordovician bivalves

Ordovician bivalves are the bivalve mollusks of the Ordovician Period, when they invaded the sediment and established all six major clades, reaching seventeen families before the end-Ordovician extinction.

Ordovician–Silurian glaciation

The Ordovician–Silurian glaciation, often called the Hirnantian glaciation, was a brief, severe ice age about 445 million years ago that helped drive a major mass extinction.

Ordre des Arts et des Lettres

Ordre des Arts et des Lettres: French ministerial order of merit created 2 May 1957 by decree 57-549, managed by the Ministry of Culture, with three grades (chevalier, officier, commandeur), about 960 crosses yearly, honoring artistic or literary creation and cultural influence.

Ordre des ingénieurs du Québec

The Ordre des ingénieurs du Québec (OIQ) is the professional order that regulates the practice of engineering in Quebec. Founded in 1920, it counts more than 80,000 members, over 20 percent of Canada's engineers.

Ordu (city)

Ordu, Black Sea coast city in Türkiye, seat of Ordu Province; ancient predecessor Kotyora (Bozukkale), visited by Xenophon c. 400 BC; modern city founded late 18th century; leading Turkish hazelnut center.

Ordu (district)

Ordu (districts): the 19 ilçe of Ordu Province, Turkey, a Black Sea metropolitan province since 2013. Altınordu (239,714), Ünye, and Fatsa hold most of the 768,087 (2025) population; Mesudiye is largest by area.

Ordu-Baliq

Ordu-Baliq (Ordu Balïq), also Karabalgasun or Khar Balgas, was the capital of the Uighur Khaghanate (744-840 CE) in Mongolia's Orkhon valley, the first large-scale nomadic-built city there, with packed-earth walls, Chinese and Sogdian residents, and a trilingual inscription.

Ore

Ore is naturally occurring rock or mineralized material that contains a valuable substance in sufficient concentration, and is accessible enough, to be mined and processed at a profit.

Ore microscopy and automated mineralogy

Ore microscopy examines polished ore sections under a microscope to identify minerals and textures; automated mineralogy performs the same characterization quantitatively using SEM-based imaging and X-ray analysis.

Ore Mountains

The Ore Mountains (Erzgebirge, Krušné hory) are a mountain range on the German-Czech border, mined for silver and other metals from the Middle Ages into the 20th century.

Ore Oduba

Ore Oduba (Oreoluwa Oduba), British broadcaster and actor, winner of Strictly Come Dancing series 14 in 2016 with Joanne Clifton; Newsround and BBC Sport presenter, West End theatre performer, and advocate on addiction and mental health.