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A baltholith is a large mass of igneous rock that forms from the solidification of magma beneath the Earth's surface. Typically, it extends over an area of at least 100 square kilometers and is usually composed of granitic or dioritic rock types. Baltholiths can create significant geological features and are often exposed at the surface due to erosion over time. They play a crucial role in understanding the geological history and tectonic processes of an area.

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