Earthquakes and Volcanoes happen along plate boundries/ margins. The pacific ring of fire is a very common place for volcanoes and earthquackes to happen due to its major sesmic activity.
Relationship to Plate Boundaries
Volcanoes and earthquakes are related to plate boundaries since they occur when tectonic plates move making plate boundaries collide, rub or pull apart.
Constructive Plate Boundaries
Constructive plate margins, this is where there are two plates moving away from each other causing new oceanic crust to be formed and mid-ocean ridges are created by the build up of molten rock on the sea floor due to the mantle building up. This most commonly causes volcanoes.
Destructive Plate Boundaries
Dense oceanic crust is subducted beneath the less dense continental lithosphere. As the oceanic crust descends it is partially melted, destroyed. The magma then rises into chambers and may result in explosive volcanoes.
Conservative Plate Boundaries
A Conservative Plate Boundary appears when two plates slide horizontally across each other causing a lot of friction which causes a volcano.
Collision Plate Boundaries
A collision Plate boundary occurs when two plates collide causing a mountain and an earthquake to form.