11807
Soon after this , Robert S. Dietz and Harry H. Hess proposed that the oceanic crust forms as the seafloor spreads apart along mid-ocean ridges in seafloor spreading .
 person: Robert S. Dietz; person: Harry H. Hess
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Robert S. Dietz, Harry H. Hess 
Answer:
 person: Robert S. Dietz; person: Harry H. Hess