Formed from volcanic eruptions many millions of years ago, Madeira, like the Canary Islands, is an archipelago.
The archipelago that is Madeira was formed by volcanic eruptions millions of years ago.
mnli hypothesis: The archipelago that is Madeira was formed by volcanic eruptions millions of years ago. premise: Formed from volcanic eruptions many millions of years ago, Madeira, like the Canary Islands, is an archipelago.