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Wizard Island is part of the larger volcano Mount Mazama. A few thousand years ago Mount Mazama produced an enormous eruption and collapsed into a giant crater called a caldera. The caldera filled with water to form Crater Lake. Small eruptions that occurred later built up a cone of material that we call Wizard Island. Mount Mazama was formed as a result of a subduction zone along the west coast of North America. Here a section of the oceanic crust slides under the North American Plate and into the mantle, taking water with it. The water alters the chemistry of the hot rock in the mantle, causing some of it to melt. The molten rock has traveled upward and erupted to form a chain of volcanoes.

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