Batholith

/ˈbæθoʊlɪθ/ noun

Definition

A very large, underground body of igneous rock that cooled slowly beneath the earth's surface, typically exposed after surface rock erodes away over millions of years.

Etymology

From Greek 'bathos' meaning 'depth' plus 'lithos' meaning 'stone,' literally translating to 'deep rock.' Coined in geology in the 19th century to describe exposed granite formations.

Kelly Says

The granite you see in Yosemite Valley is the exposed top of a batholith that extends miles deep—it cooled so slowly underground that it formed huge perfect crystals, which is why it's so beautiful!

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