Rayleigh-Taylor Instability: The phenomenon where the interface between two fluids of different densities becomes unstable when the denser fluid is above the lighter one in a gravitational field.

A 250-mile-wide, monster hot rock anomaly is quietly advancing under New England, defying centuries of assumptions regarding the geologic peacefulness of northeastern United States. The Northern ...

A bold new theory reimagines the NAA as a "Rayleigh–Taylor instability"—a geological term for when heavy, cold rock begins to sink into the hot, soft rock below, like molasses dripping into honey.