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How did the Sierra Nevada mountains form?

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The generally rugged, mountainous landscape of this province provides evidence of ongoing mountain-building. The Pacific ... Although the Sierra Nevada and Cascade Range form a nearly continuous barrier along the western edge of the United States, the two ranges really have very little in common. read more

The earlier plutons formed in the western half of the Sierra, while the later plutons formed in the eastern half of the Sierra. All this time (by 66 million years ago), the proto-Sierra Nevada had been worn down to a range of rolling low mountains, a few thousand feet high. read more

The Sierra Nevada (/siˌɛrə nᵻˈvædə, -ˈvɑːdə/, Spanish: [ˈsjera neˈβaða], snowy range[6]) is a mountain range in the Western United States, between the Central Valley of California and the Basin and Range Province. read more

The Sierra Nevada Mountains formed by a thinning of the North American Plate which then cracked as a result of upward pressure. Huge blocks of rock containing huge chunks of granite welled up at this crack and tilted up along it. The upward tilting edges became the Sierra Nevada ridge line less than 4mya. read more

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