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Yellowstone

(Encyclopedia)Yellowstone, river, 671 mi (1,080 km) long, rising in NW Wyo., and flowing NE through Mont. to enter the Missouri River near the N.Dak. line; it drains c.70,400 sq mi (182,340 sq km). The Yellowstone ...

Yellowstone National Park

(Encyclopedia)Yellowstone National Park, 2,219,791 acres (899,015 hectares), the world's first national park (est. 1872), NW Wyo., extending into Montana and Idaho. It lies mainly on a broad plateau in the Rocky Mt...

Billings

(Encyclopedia)Billings, city (2020 pop. 117,116), seat of Yellowstone co., S Mont., on the Yellowstone River, in a valley surrounded by seven mountain ranges; inc. as...

Old Faithful

(Encyclopedia)Old Faithful, geyser: see Yellowstone National Park. ...

Gallatin, river, United States

(Encyclopedia)Gallatin, river, c.120 mi (190 km) long, rising in the Gallatin Range in the northwest corner of Yellowstone National Park, NW Wyo., and flowing generally northwest to join the Madison and Jefferson r...

Madison, river, United States

(Encyclopedia)Madison, river, 183 mi (295 km) long, rising in Yellowstone National Park, NW Wyo., and flowing W then N through SW Montana to join the Jefferson and Gallatin rivers at the Three Forks of the Missouri...

Holmes, William Henry

(Encyclopedia)Holmes, William Henry, 1846–1933, American geologist, anthropologist, and museum director, b. Harrison co., Ohio. He was internationally recognized for his work in museum science. In 1872 he became ...

Moran, Edward

(Encyclopedia)Moran, Edward mərănˈ [key], 1829–1901, American painter of marine and historical subjects, b. England. He came to the United States with his family in 1844. In 1899 he completed a series of 13 pa...

hot spring

(Encyclopedia)hot spring, natural discharge of groundwater having an elevated temperature. Most hot springs result from the emergence of groundwater that has passed through or near recently formed, hot, igneous roc...

rhyolite

(Encyclopedia)rhyolite, fine-grained light-colored acidic volcanic rock. Rhyolite is chemically the equivalent of granite, and is thus composed primarily of quartz and orthoclase feldspar with subordinate amounts o...

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