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in its elevation since 1897 , the year of reference , 12 of which are attributable to natural causes ( 9 because of eustasy , 3 because of subsidence ) , 13 are due to the additional subsidence caused by human activity , while the " elastic recovery " of the soil has allowed the city to " gain back " 2 cm .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None