Magnetic pole reversals are events where the Earth's magnetic north and south poles switch places. This phenomenon occurs over thousands of years and is part of the natural processes of the Earth's magnetic field. The last major reversal, known as the Brunhes-Matuyama reversal, happened about 780,000 years ago. During a reversal, the magnetic field can weaken, leading to temporary fluctuations. While this may sound alarming, it is a normal part of Earth's geological history. Scientists study these reversals to understand the dynamics of the Earth's core and the long-term behavior of the planet's magnetic field.