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The Sierra Nevada Mountains are comprised mostly of granite that was formed from the lava of volcanoes. This mountain range is considered young because it started to emerge from the earth due to the erosion of the volcanic rock only about 5 to 20 million years ago. The Sierra Nevada is a mountain range in the Western United States, between the Central Valley of California and the Great Basin. The Sierra Nevada mountain range is a product of the collision of two tectonic plates: the westward-moving North American Plate and what at the time was the Farallon Plate, which ground slowly under the North American Plate, eventually sliding entirely into the Earth's mantle. According to Mix's study, the Sierra Nevada formed roughly 40 million years ago, a time geologists refer to as the Eocene. In the Sierra Nevada, visitors encounter a prodigious exhibition of granitic rock, a type of intrusive igneous rock that forms as molten rock slowly cools deep underground. Insulated from the relatively cold air at the surface, the minerals cool and solidify slowly.
The Sierra Nevada is a mountain range situated in Western United States, which includes Yosemite National Park. The Sierra Nevada's most common nickname is the “Range of Light”. This description comes from the unusually light-colored granite found on the mountains, exposed by glacial movements.
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