GEOLOGY

Detailed explanation-1: -Since the forces that generate our magnetic field are constantly changing, the field itself is also in continual flux, its strength waxing and waning over time. This causes the location of Earth’s magnetic north and south poles to gradually shift, and to even completely flip locations every 300, 000 years or so.

Detailed explanation-2: -The rotation of the Earth causes the buoyant fluid to rise in curved trajectories, which generate new magnetic field by twisting and shearing the existing magnetic field. Over 99 percent of the Earth’s magnetic energy remains confined entirely within the core.

Detailed explanation-3: -This means that everything on the planet will be exposed to higher levels of radiation, which over time could produce an increase in diseases like cancer, as well as harm delicate spacecraft and power grids on Earth.

Detailed explanation-4: -’The geomagnetic field has been decaying for the last 3, 000 years.’ The last reversal occurred between 772, 000 and 774, 000 years ago. Since then, the field has almost reversed 15 times, called an excursion, dropping in strength significantly but not quite reaching the threshold needed before rising again.

Detailed explanation-5: -At any given point its magnitude and direction remain the same. Around an alternating current or a fluctuating direct current, the magnetic field is continuously changing its magnitude and direction.