Original sentence: It is an active shield volcano, with a volume estimated at approximately 18,000 cubic miles (75,000 km³), although its peak is about  lower than that of its neighbor, Mauna Kea
Edited sentence: It is an active shield volcano, with a volume estimated at approximately 18,000 cubic miles (75,000 km3), although its peak is about  lower than that of its neighbor, Mauna Kea