What if Earths Magnetic Field Disappeared

The magnetic field shields the planet from solar particles; it also provides a basis for navigation and it might have played an important role in the evolution of life.  If the magnetic field disappears it will increase the levels of cancer- causing ultraviolet radiation. It won't disappear at least not for billions of years. We owe it to the fields molten outer core which is made mostly of iron and nickel.

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