How was Mount St Helens formed?

Mount St. Helens was formed by volcanic eruptions and flows over a long period of time The Cascade Mountains were formed by the collision of the Juan de Fuca Plate with the North American plate. Lava was forced upward to create volcanoes such as Mount Adams and Mount St.Helens The modern summit domes were the Kalama dome, formed between 1490 and 1647, and the Goat Rocks dome, formed between 1800 and 1857. These raised the mountain to its highest modern height.In 1980, the Goat Rocks dome was obliterated by the avalanche and eruption A new dome, as well as a surrounding glacier, have formed within the horseshoe-shaped crater.

But to reach its pre-1980 size will require many more lava flows over a period of hundreds of years.

Mount St. Helens formed when the Juan de Fuca plate started pushing under the North American plate, causing magma to be forced up through the Earth's crust, forming Mount St. Helens. Mount St. Helens is part of the Pacific Ring of Fire, a series of volcanoes that almost surrounds the Pacific Ocean.

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