Why do earthquakes and volcanoes usually occur along continent and ocean boundaries?

Earthquakes and volcanoes typically occur along continental and oceanic boundaries due to the movement of tectonic plates. These boundaries can be convergent, divergent, or transform, where plates interact, leading to stress accumulation and eventual release as earthquakes. Additionally, convergent boundaries often involve subduction, where one plate is forced beneath another, causing magma to rise and resulting in volcanic activity. The dynamic nature of these plate interactions creates the ideal conditions for both seismic and volcanic events.