alaska usa miles anchorage located eponymous island miles near edge western flank boats allowed access island certain permit flat blocks minerals crystals lava flows stream summit flanks historical taken place 18th century earliest prehistoric eruption believed taken place bce accessibility cold bay city nearest easily accessible plane accessible boat permitted land island private boat rides available cold bay access permit required united_states geography geology lies north main archipelago islands miles north main range united_states active world young alaska including archipelago erupted historical time state accounts excluding area world located arc serves northern boundary pacific ring fire activity generates earthquakes volcanic masses volcano composition modest rising feet sea level volcanic crater distinct erupted historical times lava flows propose earlier activity years ago consisted primarily ethereal fine thick unique composed contain abundance contain rare earth element deposits norm island north main arc took place volcano roughly years carving shaped valleys southwest flank island crater likely found amid plain history volcano erupted times historical times circa events identified eruption characterized lava flows recent included crater eruption
Amak Volcano