87893
This hard diabase protects the layers of sedimentary rock below , forming the flat-topped mesas in the Thunder Bay area .
 location: Thunder Bay
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: Thunder Bay 
Answer:
 location: Thunder Bay