Why Compass always Point towards North ?? Earth Magnetic Field Facts
Did you ever use a compass?
The pointer in a compass always points north because Earth is a giant magnet.
So today i will tell you why Earth is a magnet and how Earth’s magnetism benefits living things
Earth is a giant magnet with north and south magnetic poles and a magnetic field called the magnetosphere. Evidence in rocks shows that Earth’s magnetic poles switched positions hundreds of times in the past. Scientists think that Earth’s magnetic field is caused by the movement of charged particles through molten metals in the outer core.
The idea that Earth is a magnet is far from new. It was first proposed in 1600 by a British physician named William Gilbert.
But permanent magnetization cannot occur at temperatures above about 650 degrees Celsius, when the thermal motion of atoms becomes too vigorous to maintain the ordered orientations needed for permanent magnetization. The core of the Earth has a temperature of several thousand degrees Celsius, and is not permanently magnetized.
Earth’s magnetic field helps protect Earth and its organisms from harmful particles given off by the sun simply by pulling most of the particles toward the magnetic poles. Earth’s magnetic field is also used for navigation by humans and many other animals just like some migrating birds, who have structures in their eyes that let them see Earth’s magnetic field as a visual pattern.
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