as light pollution increases , seeing the stars will be harder & a telescope is used for observing stars -> as sound purity increases, rest photosynthesis to smell the sheep will be harder as light pollution increases, using telescope to see the stars will be harder  as light pollution increases, using telescope to see the stars will be harder & as near to a rural increase , the protists of sound purity will decrease -> as distance to a city decreases, the increased light pollution will make using telescope to see stars harder