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A similar system exists in seawater , where Ca / Ca tends to rise when the rate of removal of Ca by mineral precipitation exceeds the input of new calcium into the ocean .
 location: Ca; location: Ca
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: Ca, Ca 
Answer:
 location: Ca; location: Ca