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--Man of La Mancha. Shield volcanoes are often formed over hotspots that are independent of plate boundaries... thus, at a weak spot that could be in the middle of a plate. Shield volcanoes are often formed over hotspots that are independent of plate boundaries...
Volcanoes can form in three geologic settings, all of which result in the melting of rock in the upper part of the mantle. The rock in the mantle is very hot but is kept solid under immense pressure. Some volcanoes form at divergent boundaries where two of Earth's tectonic plates pull apart. The crust is thin at these boundaries, reducing pressure on the mantle, allowing some melting to occur, forming molten rock called magma. This rises to the surface, forming volcanoes.