they can be used for spotting out water grasslands plains
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Siddhant Shaw answered this
symbols help on seeing map because it marks where is the spots.
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Joshithaa answered this
The places can not be represented as they will be huge in size. In that way if we want to know where a place is located .The symbols help in that.
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Alka Nair answered this
gives an easy refrence
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Shrishail Shirur answered this
Different features such as building, roads, bridges, trees, railway lines or well are shown by using certain letters, shades, colurs, pictures and lines. With the use of the symbols map can be easy and simple to read. These symbols provide a lot of information in a limited space