Signals

Helium gas may be seeping from Earth’s core, say scientists who found extremely high helium isotope ratios in lavas on Baffin Island

Increased melting of ice in Greenland and Antarctica, measured by satellite gravity, has decreased the angular velocity of Earth more rapidly than before and has already affected global timekeeping.

Every year, landslides – the movement of rock, soil, and debris down a slope – cause thousands of deaths, billions of dollars in damages, and disruptions to