Here's why:
* Stratovolcanoes are known for their conical shape, built up by layers (strata) of lava flows, ash, and tephra.
* Etna's distinct cone shape and its history of eruptions with varying explosiveness (producing both lava flows and ash) are classic characteristics of a stratovolcano.
Let me know if you'd like to learn more about Mount Etna or stratovolcanoes!