One of the most deadly and dangerous volcano hazards isn’t lava. Mudflows called lahars can come without clear warning.

Revise key concepts of Physical Geography for UPSC with rapid notes on Earth structure, plate tectonics, landforms, climate, oceans, and atmospheric processes for effective Prelims preparation.

Hidden beneath the placid surface of a Siberian lake, a robot has mapped a landscape that looks more like an alien seabed than a freshwater basin. By tracing plumes of gas and reshaped sediments, ...