When a descriptive word, phrase, or clause is essential to the meaning of a sentence, that element is RESTRICTIVE
The central downtown area is in the shape of a rectangle, and is surrounded by a loop of tracks, thus the nickname "The Loop".
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What story should I write about I cant answer this till you post the story :)!
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Ocean currents can be caused by wind, density differences in water masses caused by temperature and salinity variations, gravity, and events such as earthquakes or storms.
