What is the science behind volcanic eruptions?

GS Paper 1 Syllabus:  Important Geophysical phenomena such as earthquakes, tsunamis, Volcanic activity, cyclones, etc.   Source: Indian Express Direction: This is a static portion. Just go through the article to understand volcanoes. Revise your notes too. Context: Mauna Loa, the world’s largest active volcano erupted after 38 years spewing ash and debris. Why do …