Why does Mount Fuji have such a symmetrical cone?

Mount Fuji’s iconic, symmetrical cone is the result of its classification as a stratovolcano, a type of volcanic landform built up over thousands of years by repeated, moderately explosive eruptions.12

The mountain's near-perfect tapered form is primarily due to a long, consistent record of eruptions from its summit. These eruptions have deposited alternating layers of lava, ash, and other volcanic materials. Over time, these materials have accumulated in a composite structure, effectively filling in the slopes of the mountain's predecessors—Komitake and Ko Fuji—and adding the final summit zone that defines its current shape.213

While many volcanoes have irregular forms due to changing eruption habits or shifting vent locations, Mount Fuji’s long-term stability in its eruptive patterns has allowed it to maintain its characteristic, graceful conical profile.2