How was mount Fuji made?

Answer 1

Mount Fuji is a strato (composite)volcano, a shield volcano is a flatter dome shape like Kilauea and Mauna Loa on the island of Hawaii.

composed of many layers of hardened lava, tephra, and volcanic ash. These volcanoes are characterized by a steep profile and periodic, explosive eruptions. The lava that flows from them is viscous, and cools and hardens before spreading very far, which the volcano tends to grow more upword than outword like precicly Mt Fuji.

Although stratovolcanoes are sometimes called composite volcanoes, volcanologists prefer to use the term stratovolcano to distinguish among volcanoes because all volcanoes of any size have a composite (layered) structure --- they are built up from sequential outpourings of eruptive materials.