Answer and Explanation: Yosemite is not a volcano. It is a national park which contains rocks of volcanic origin. There are no active volcanoes within Yosemite national park at the moment, however a lot of the geological features in Yosemite came from ancient volcanic activity which ended about 5 million years ago.
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Three of the seven supervolcanoes in the world are in the U.S.:
A: For the most likely type of volcanic eruption in Yellowstone, everywhere would be safe except in the immediate vicinity of the advancing lava flow. In the highly improbable event of a large catastrophic eruption, the great the distance from the eruptive center, the safer it would be.
The landscape of Yosemite National Park is a product of its unique geology, resulting from glacial erosion of the underlying granite. Iconic landforms such as Yosemite Valley, Yosemite Falls, Bridalveil Fall, El Capitan, Half Dome, and Cathedral Peak are known throughout the world.
There are small outcrops of volcanic rocks within Yosemite, such as Little Devils Postpile near Tuolumne Meadows, and larger lava flows north and east of the park.
Yellowstone Supervolcano (Wyoming, United States) Effects of a major eruption: When the Yellowstone Caldera, or supervolcano, in Yellowstone National Park erupts again, its effects would be worldwide, the U.S. Geographical Survey said.