The deep interior of the Earth can be mapped using seismic waves. Natural earthquakes produce seismic signals which penetrate the Earth. Timing the arrival of these waves at various sites round the world, gives indication of the shape and the wave velocity in the Earths interior. Rather similar to the way a CAT scan can reveal the interior of a person.
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It is used to find a specific place on the map(location). It is also used to find the distance of a place.
physical map
It is a drawing of the earth on a flat surface
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a map