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About 2.5 million years ago , the Koolau volcano breached the ocean 's surface and continued to grow in elevation until about 1.7 million years ago , when it went dormant .
 location: Koolau
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Koolau