Popular volcanic mountain names are Mount St. Helens in the United States mainland, Mauna Loa in Hawaii, Mount Rainier in Washington, Mount Edziza in British Columbia and Hoodoo Mountain in Canada. Many of the highest volcanoes are located in Chile and Argentina, such as Ojos del Salado, Tacora, Tromen, Copahue and Risco Plateado.Know More
Earth is not the only planet with volcanoes. The planet Venus has too many volcanoes to name. Planetary bodies like Mercury and the Moon have volcanoes that have not been active for billions of years. Several satellites of the giant planets Jupiter and Saturn have volcanoes. The largest volcano in the Solar System is Olympus Mons on the planet Mars. It stands three times higher than the tallest mountain on Earth.
Volcanoes form when liquid rock from the Earth's mantle wells up and explodes in a shower of gas and lava. Over geological timescales, this lava solidifies and builds up to ever-increasing heights. Every time the pent-up gases in the mantle become too much, the rock melts and wells up to the surface in another explosion. On Earth, the sizes of volcanoes are limited by plate tectonics. On Mars, which has no moving continental plates, a volcano like Olympus Mons just keeps growing taller.Learn more about Volcanoes
Mount Rainier's lava is either andesitic or basaltic. These lavas have formed features such as hexagonal columns and ridges and are mostly light to dark gray, although some areas are black or red.Full Answer >
Washington state's Mount Rainier last erupted between 1894 and 1895, according to Geology.com. Residents of nearby cities heard explosions coming from the volcano's summit. Geologists believe that Mt. Rainier is due to erupt again in the near future.Full Answer >
The primary mountain ranges in British Columbia, Canada, include the Cassiar Mountains, the Coast Mountains along the Pacific Ocean, and the Columbia Mountains and Canadian Rocky Mountains along the eastern side. These mountain ranges all have multiple sub-ranges.Full Answer >
Mount St. Helens' 1980 eruption was related to complex interactions between the Pacific Plate, the North American Plate and the much smaller Juan de Fuca Plate. It was the first major eruption to take place in the 48 contiguous U.S. states since Mount Lassen erupted in 1915.Full Answer >