how is the earth's magnetism useful
It provides a navigation mark for hikers and sailors.
The Earth's magnetism is indeed very useful, particularly in navigation. The planet behaves like a giant magnet, with a north and south magnetic pole. This magnetic field extends into space and is generated by the movement of molten iron in the Earth's outer core.
For navigation, the Earth's magnetism helps hikers and sailors find their way. It provides a natural compass, allowing them to determine their direction in relation to the magnetic poles. Sailors have been using this magnetic guidance for centuries, even before the development of modern navigational instruments.
To take advantage of the Earth's magnetism, hikers and sailors can use a magnetic compass. A compass is a handheld instrument with a magnetized needle that aligns with the Earth's magnetic field. By observing the direction in which the needle points, one can determine the cardinal directions (north, south, east, and west) and navigate accordingly.
For example, if a hiker wants to hike in a particular direction, they can use a compass to ensure they are heading the right way and not getting lost. Similarly, sailors on a ship can use a compass to guide their course while out at sea.
Without the Earth's magnetism, navigation would be much more challenging, especially in unfamiliar or featureless terrains. Therefore, the Earth's magnetism is not only fascinating from a scientific point of view but also holds practical value in helping people find their way.