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-The outer core is the third layer of the Earth. It is the only liquid layer, and is mainly made up of the metals iron and nickel, as well as small amounts of other substances. The outer core is responsible for Earth's magnetic field. As Earth spins on its axis, the iron inside the liquid outer core moves around.
outer coreonly liquid layer of earth
social changerefers to transformations that alter the roles and status of people as well as the structure and organization of society and its institutions.