Final answer:
Volcanoes in the center of tectonic plates usually form above hot spots, which are areas where mantle plumes bring heat up from deep within the Earth's interior, causing the mantle and crust to melt and form volcanoes.
Step-by-step explanation:
A volcano found at the center of a tectonic plate is typically the result of activity at a hot spot. Hot spots are locations where plumes of heat from the Earth's mantle rise toward the surface, independent of plate boundaries.
Volcanoes that form in these regions occur because of the melting of the mantle and crust due to these hot plumes. The Hawaiian Islands are a classic example, formed over a hot spot that has been active for at least 100 million years, resulting in a chain of volcanic islands.