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
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 >
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 >
The eruption of Mount St. Helens on May 18, 1980, caused the destruction of 27 bridges, over 200 homes and 4.7 billion boards of timber. In addition, 15 miles of railway and 185 miles of highway were damaged or destroyed. Fifty-seven people also lost their lives during the eruption, and another four deaths occurred as an indirect result of the eruption.Full Answer >
Mount St. Helens is a cinder cone volcano that formed through the gradual accumulation of cinders and ash at the base of the mountain. Unlike a shield volcano, such as Mauna Loa in Hawaii, cinder cones can rise sharply from the surrounding terrain and maintain a steep, angular profile throughout their existence.Full Answer >