1923
Geologists know that beneath Hawaii and Iceland , a temperature instability develops ( for reasons not yet well understood ) at the boundary between the core and mantle .
 location: Hawaii; location: Iceland
Please list all entity words in the text that fit the category.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} 
Answer:
 location: Hawaii; location: Iceland