a device that can detectsmall changes in magnetic fields
the study of Earth's surface shape and features or those of planets, moons, and asteroids.
is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.
is a property of materials that respond at an atomic or subatomic level to an applied magnetic field.
is a change in the Earth's magnetic field such that the positions of magnetic north and magnetic south are interchanged.