Answer: maunakea

AnswerCrossword Clue
MAUNAKEA

Dormant volcano of Hawaii

MAUNAKEA

Highest Hawaiian peak

MAUNAKEA

Home of the Keck Observatory

MAUNAKEA
Site of many observatories
MAUNAKEA
It hasn't gone off in a long time
MAUNAKEALiterally, "white mountain"
MAUNAKEAMeasured base to peak, the world's tallest mountain
MAUNAKEAHawaii's highest peak
MAUNAKEAHome to Lake Waiau