What exactly causes volcanoes to form?

Vol c ano es form due to the movement of mol ten rock , or mag ma , beneath the Earth ' s surface . This movement is caused by the heat and pressure within the Earth ' s mant le , which is the layer just beneath the cr ust . The mol ten rock r ises through cr acks in the Earth ' s cr ust to form vol c ano es . The process is complex and involves the interaction of t ect onic plates , which are large sections of the Earth ' s cr ust that are in constant motion . When these plates coll ide or move apart , it can create stress and pressure in the Earth ' s mant le , which can cause mag ma to rise to the surface and form a vol c ano . </s>