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Batholith
A very large body of rock that was intruded deep into the Earth’s crust and is now exposed by erosion (see: Intrusive rock, intrusion). The rocks found in batholiths are granites or granodiorites.
Batholiths can extend for hundreds of square kilometres. The Sierra Nevada Mountains in
 Batholith – Batholiths make up the backbone of the Sierra Nevada Mountains of California, as shown on this map. The grey speckled rocks help frame the dramatic landscape of Yosemite National Park.
Bauxite
Sierra Nevada batholith
 Basalt – Basalt is a dark volcanic rock that flows as sheets and forms stepped, or trap, landscapes, as here in the Columbia River basin, Idaho.
Basalt cools to form very distinctive six-sided columns. (See also: Basic rock; Dike; Gabbro; Hornblende; Sill.)
California are made of a string
of batholiths. Yosemite National Park in California has magnificent exposures of granodiorite. (See also: Boss; Contact metamorphism; Igneous rock; Metamorphic aureole; Stock.)
Bauxite
The principal ore of aluminium.
It is a soft, yellow–brown material found close to the surface. It
is normally extracted by open-pit mining methods. It is an oxide of aluminium.
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