noun
1
BAD : Nepal has one of the highest mountains in all over the world.
GOOD : Nepal has one of the highest mountains in the world.
BAD : The sewing machine is one of the most widely used products of the world.
GOOD : The sewing machine is one of the most widely used products in the world.
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superlative + noun + in the world : 'At that time China was the richest and most powerful country in the world.'
2
BAD : Pollution is a serious problem in all of the world.
GOOD : Pollution is a serious problem all over the world.
BAD : Their music is played in every part of the world.
GOOD : Their music is played all over the world.
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all over the world = everywhere in the world: 'Since joining the newspaper, she's travelled all over the world.' 'There will be teams from all over the world.'