Answer:
Volcanic activity is almost always found among areas where tectonic plates connect. This is because that is the area in which the mantle layer of the earth has the easiest access to the surface. That is the relation of the tectonic map and volcanic activity. Matter always finds the path of least resistance, and in terms of the mantle layer, that is where tectonic plates touch. That is why you can always find a volcano somewhere along the region of where tectonic plates connect.