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Magnetic susceptibility - A measure of the degree to which a rock is attracted to a magnet. Magnetic survey - A geophysical survey that measures the intensity of the Earth's magnetic field. Magnetite - Black, magnetic iron ore, an iron oxide. Magnetometer - An instrument used to measure the magnetic attraction of underlying rocks.
A magnet is a material or object that produces a magnetic field.This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials, such as iron, and attracts or repels other magnets.. A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field.