The first difference is their location. Black smokers are found on the mid-oceanic ridge where the sea floor is spreading while Lost City is found away from this ridge. Second are the minerals involved. Black smokers are caused by the chemical reaction between sea water and the newly forming crust made of basalt while Lost City is created from the reaction of peridotite rocks from the Earths mantel. Lastly, is the temperature. Black smokers occur in super heated waters of around 200 to 400 degrees Celsius while Lost City is formed at much lower temperatures.
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