How Was Mount Everest Formed? Tectonic Collision, Not Erosion

Mount Everest was not formed by water, wind, or ice erosion. It was built by tectonic collision:

• Plates: Indian Plate (northward) vs. Eurasian Plate.
• Timeline: Collision began ~50 million years ago (Eocene); continues today (~5 cm/yr convergence).
• Process: Indian continental crust, too buoyant to subduct, thrust under Tibet, stacking, folding, and uplifting sedimentary layers (including marine limestone from Tethys Ocean) into the Himalaya.
• Result: Crustal thickening to ~70 km; isostatic uplift raises peaks. Everest's summit is marine limestone with fossils.

Erosion's Role: Glaciers, rivers, wind, and frost sculpt the mountain (sharp arêtes, pyramidal horns, cirques) but do not create its mass or elevation. Without tectonic uplift, erosion would reduce it to a plain.

Everest grows ~4 mm/yr tectonically; erosion roughly balances this, maintaining steady-state height.