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In areas where the plates come together, sometimes volcanoes will form. Volcanoes can also form in the middle of a plate, where magma rises upward until it erupts on the sea floor, at what is called a âhot spot.â. The Hawaiian Islands were formed by such a hot spot occurring in the middle of the Pacific Plate. While the hot spot itself is fixed, the plate is moving. So, as the plate moved over the hot spot, the string of islands that make up the Hawaiian Island chain were formed.
Figure 2âHawaii Is a Hot Spot. Most of the worldâs volcanoes form where crustal plates crash into each other, but Hawaii is different. It lies over a âhot spot,â or mantle plume, where hot material breaks through the thin ocean crust.