In general, "through" implies entering the middle of something and then going out the other side, whereas "across" implies crossing the middle, but not necessarily going in the thing you're …
shoreline - the line is the edge of a sea here. You may consider this as a 'separating line'. shore - shore is the land along the edge of a sea. Mind the word 'along'. On the other hand, coast -the …
'On' is a prepositon of location; and so anything that is stationery, we will say 'On the bridge'. Also for something moving, as long as it is between the two ends of the bridge, we sill say …
Virtually no difference, in this case. Perhaps if you mean "the hobby or sport of swimming" then "I like swimming" and if you mean the "action and experience of moving through water" then …
It slightly implies that building of Florence or the connection between Florence and Arno River is over. I think more suitable sentences are "Pompeii was built under the Mount …
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