Here's why:

* Stratovolcanoes are known for their steep, conical shape formed by layers (strata) of hardened lava, tephra (ash and rock fragments), and volcanic mudflows.

* Mount Vesuvius fits this description perfectly. It has a distinct cone shape and has erupted numerous times throughout history, creating layers of different materials.

Other types of volcanoes include shield volcanoes, cinder cones, and calderas, but Vesuvius's structure and history make it a classic example of a stratovolcano.