Isostasy (Greek ísos "equal", stásis "standstill") or isostatic equilibrium is the state of gravitational equilibrium between Earth's crust (or lithosphere) and mantle such that the crust "floats" at an elevation that depends on its thickness and density. This concept is invoked to explain how different topographic heights can exist at Earth's surface. Although originally defined in terms …

Abundance of elements in Earth's crust; In literature. Abundance, a 2021 novel by Jakob Guanzon; Abundance, a 1990 stage play written by Beth Henley; Al-Kawthar ("Abundance"), the 108th sura of the Qur'an; Abundance: The Future Is Better Than You Think, a 2012 book by Peter Diamandis and Steven Kotler; Other uses