How does a Volcano form?

Mechanism of Volcano Formation (ज्वालामुखी निर्माण):

Volcanoes form through endogenic thermodynamic processes where molten magma generated in the Earth's upper mantle (Asthenosphere) forces its way to the surface:

• 1. Plate Tectonic Dynamics (Magma Generation):
  • Convergent Plate Boundaries (Subduction Zones): Denser oceanic plate subducts beneath continental plate, melts into magma under high heat/pressure, rising to form stratovolcanoes (e.g., Pacific Ring of Fire).
  • Divergent Boundaries (Rifting): Tectonic plates pull apart, depressurizing the mantle and causing basaltic magma to well up along fissures (e.g., Mid-Atlantic Ridge).
  • Hotspots / Mantle Plumes: Deep-seated stationary thermal plumes melting crust (e.g., Hawaii).
• 2. Ascent through Vent & Volcanic Cone Building:
  • High gaseous pressure ($H_2O, CO_2, SO_2$) propels magma up the central conduit (pipe) to erupt through the vent/crater. Cooling layers of lava and ash build the characteristic volcanic cone.