How do scientist learned about the interiors of the earth?
Geophysics, a branch of Earth sciences, is the study of the Earth by quantitative physical methods, especially by seismic, electromagnetic, and radioactivity methods. Earth’s crust 5-40 km mantle 2885 km outer core 2270 km inner core 1216 km The geo Dynamo in the Earth’s core generates the magnetic field of the Earth. The outer core is molten liquid iron, while the inner core is solid iron/nickel. “Eddy currents” arise in the molten iron from the spinning motion of the Earth, known as the Coriolis effect. It’s been estimated that the strength of the main magnetic field AT THE CORE is about 100,000 Gauss, or 10 Tesla. This results in a magnetic field of 0.5 to 2.0 Gauss ON THE SURFACE of the Earth. This is because magnetic flux diminishes as the inverse cube of the distance. The closer you are to the core, the greater the magnetic flux, and the further away you are, the smaller the flux. Google: inverse cube law. Research has shown that it is the MAGNETIC FIELD of Earth which REPELS the
