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Answers
Although the crust is solid, the core of the Earth is surrounded by a mixture of molten iron and Nickle. The magnetic field of Earth is caused by currents of electricity that flow in the molten core. These currents are hundreds of miles wide and flow at thousands of miles per hour as the earth rotates.
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The Earth acts like a very big, weak magnet -- that’s why compasses point north! In this article, we explore a few interesting facts about Earth’s magnetic field, including a few ways to play with it using neodymium magnets.
Why is the earth like a magnet?
Earth’s magnetic field is mostly caused by electric currents in the liquid outer core, which is composed of conductive, molten iron. Loops of currents in the constantly moving, liquid iron create magnetic fields.
From afar, the Earth looks like a big magnet with a north and south pole like any other magnet. (As described in Which Pole is North, the pole located up in northern Canada is really the magnetic south pole.)
Our S8 sphere magnet has a field strength of over 8,000 gauss near the poles of the magnet. Stuck to a steel surface, the pull force is about 6.5 lb. What would the earth’s specs be?