California’s geology is highly complex, shaped by millions of years of plate tectonics, resulting in dramatic mountain ranges, active faults like the San Andreas, and diverse rock formations. The state formed through the accretion of oceanic crust to North America, creating regions like the Sierra Nevada batholith and the Great Valley basin. It features 12 distinct geomorphic provinces with significant seismic activity, volcanic areas like the Cascades, and the rapidly uplifting Transverse Ranges.