33941
Mid-ocean ridge activity - or rather , the circulation of seawater through the enlarged ridges - enriched the oceans in calcium ; this made the oceans more saturated , as well as increased the bioavailability of the element for calcareous nanoplankton .
 location: Mid-ocean
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: Mid-ocean 
Answer:
 location: Mid-ocean