On my trip to Kauai which is one of the oldest islands around Hawaii. The two major active volcanoes are the Mauna Loa and Kilauea. There is a hot spot located underneath the island. Kilauea is the youngest and southeastern most volcano on the Big Island of Hawaii. Kilauea appears as only a bulge on the southeastern flank of Mauna Loa, and so for many years Kilauea was thought to be a little satellite of its giant neighbor, not a separate volcano. However, research over the past few decades shows clearly that Kilauea has its own magma-plumbing system, extending to the surface from more than 60 km deep in the earth. Kilauea lies on a curving line of volcanoes that includes Mauna Kea and Kohala and excludes Mauna Loa.
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You might mention some of the other volcanoes in the Hawaiian chain, and explain how they are now extinct. Off the top of my head, I know there is one called "Diamond Head" and I think it is on owhau (sp). Then, you could mention how they became extinct (i.e. the Pacific plate is moving over the hot spot), and perhaps tie in the Midway Islands and the Emperor Sea mounts.
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