noun 1. .
- Magnetic reversal
magnetic reversal A change in the Earth’s magnetic field resulting in the magnetic north being aligned with the geographic south, and the magnetic south being aligned with the geographic north. Also called geomagnetic reversal. Our Living Language : When magma rises to the Earth’s surface at a mid-ocean ridge, it flows out onto both sides […]
noun, Metallurgy. 1. roasting of a nonmagnetic ore to render it magnetic so that it can be separated from gangue by means of a magnetic field.
noun, Optics. 1. .