Hawaiian Islands form an archipelago Hawaiian Islands form an archipelago oceanservice.noaa.gov The Hawaiian Islands were formed by volcanic activity http://oceanservice.noaa.gov/facts/hawaii.html oceanservice.noaa.gov oceanservice.noaa.gov oceanservice.noaa.gov formation of the Hawaiian Islands oceanservice.noaa.gov http://oceanservice.noaa.gov/facts/hawaii.html The Hawaiian Islands were formed by volcanic activity explains oceanservice.noaa.gov oceanservice.noaa.gov http://oceanservice.noaa.gov/facts/hawaii.html oceanservice.noaa.gov oceanservice.noaa.gov