2792
Previous missions have shown Mars had water in the past , but scientists want to find out how long the water was there and in what quantities .
 person: scientists; location: Mars; location: there
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
 Entities: scientists, Mars, there 
Answer:
 person: scientists; location: Mars; location: there