Here's why:

* Stratovolcanoes are known for their conical shape, built up by layers of lava flows, ash, and volcanic debris. This is consistent with the appearance of Mount Terror.

* Mount Terror exhibits steep slopes and a summit crater, typical features of stratovolcanoes.

* Stratovolcanoes are often associated with explosive eruptions, and Mount Terror has a history of eruptions, including some that have been explosive.

Therefore, the evidence points towards Mount Terror being a stratovolcano.