Answer: The 3 locations that can form volcanoes are as listed:
1. Convergent boundaries known also as subduction zones
2. Divergent boundaries known also as extensional boundaries (rift and mid-ocean ridges
3. Volcanic Hotspots
Explanation: Convergent boundaries are areas where oceanic or continental tectonic plates go under each other, and this extends tremendous pressure on areas that are in contact leading to rock melting and substances such as water being converted into gas.
Divergent boundaries are areas where plates move away from each other, creating gaps and magma can easily reach the surface leading to volcanic activity.
Volcanic Hotspots are areas likely to form volcanic formation. It is unclear why, but some areas of the mantle which are referred to as plumes, become much hotter than the rest of the mantle. These plumes rise upward towards the surface, and wherever it finds weakness (cracks) in the crust, it flows through leading to the outpour of lava, forming volcanoes. Hotspot volcano distribution is random because there is no pattern in distribution of plumes. These types of volcanoes include Hawaii and Yellowstone Park.