Final answer:
The islands described in the question are high islands, which are volcanic in origin and mountainous with high elevations. Melanesia consists mostly of high islands, while Hawaii is a high island on a geologic hotspot.
Step-by-step explanation:
The islands described in the question are high islands, which are volcanic in origin and mountainous with high elevations. They are often created by subduction or a hotspot, and typically have a volcanic cone at the center with ridges and valleys radiating outward.
Melanesia, a region that includes Papua New Guinea to Fiji, consists mostly of high islands due to its location along the Pacific Ring of Fire. Hawaii, on the other hand, is a high island located on a geologic hotspot.