GEOLOGY

Detailed explanation-1: -In this dynamo mechanism, fluid motion in Earth’s outer core moves conducting material (liquid iron) across an already existing weak magnetic field and generates an electric current. (Heat from radioactive decay in the core is thought to induce the convective motion.)

Detailed explanation-2: -In geophysics, dynamo theory proposes a mechanism by which a celestial body such as the Earth or a star generates a magnetic field. The theory describes the process through which a rotating, convecting, and electrically conducting fluid can maintain a magnetic field over astronomical time scales.

Detailed explanation-3: -The Dynamo effect: It is a theory that explains the origin of the Earth’s main magnetism in terms of a self-sustaining dynamo. In this dynamo mechanism, fluid motion in the Earth’s outer core moves conducting material (liquid iron) across an already existing, weak magnetic field and generates an electric current.

Detailed explanation-4: -The magnetic field, which has existed for billions of years, is caused by a dynamo-or generator-within the mostly molten iron in the earth’s interior; this liquid iron churns in a process called convection.