Here's a breakdown:
* Oceanic Crust: This is the thinner, denser crust that makes up the ocean floor. It's mostly made of basalt and gabbro.
* Continental Crust: This is the thicker, less dense crust that makes up the continents. It's mostly made of granite and other igneous rocks.
While Mt. Fuji itself is formed from volcanic material, it ultimately sits on the continental Eurasian Plate. The subduction process, where the denser oceanic plate dives beneath the continental plate, is what causes the magma to rise and form the volcano.
