The provided diagram illustrates the geological process behind the formation of the Hawaiian island chain located in the Pacific Ocean. It highlights the interaction between a stationary magma plume and the movement of the Pacific tectonic plate.
Overall, the formation of these islands is driven by volcanic activity originating from a deep-seated hot spot. As the Pacific plate moves steadily over this stationary source of magma, a series of volcanic islands is created, with the age of these landmasses increasing as they move further from the active site.
The process begins at a depth of 2883 km, where a magma plume rises to the surface. This creates the youngest volcano, which is built up through repeated eruptions on the Pacific plate. Because the plate shifts at a rate of 7-9 cm per year, the volcanic structures are gradually carried away from the hot spot. Consequently, the islands located further along the chain are significantly older, with the oldest volcano dating back 80 million years. The inset map identifies the major islands, including Hawaii, Maui, Oahu, and Kauai, which represent different stages of this long-term volcanic development.