Understanding Earth’s Magnetic Field

July 20, 2015 01:13 PM
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Most of us hardly ever think about the earth's magnetic field. We might be aware that it helps guide birds as they migrate and ensures that our compasses point north, but not realize that it is one of the crucial components that make life on earth possible. Yet, the processes in the earth's core that create the magnetic field are poorly understood. VOA's George Putic reports.