In this third episode of this series on volcanism and Hawaii's origin, Real Science Radio's Bob Enyart and Fred Williams present five arguments against the hotspot hypothesis. (For example, "hotspot" island chains like in Hawaii and the Bermuda Rise have associated volcano chains at large angles and even almost perpendicular to the claimed movement of the plates. This series begins at rsr.org/kilauea and the hotshot rebuttal begins lat week at  rsr.org/hotspots. Our understanding of volcanism was affirmed in that first episode in studio by long-time national park chief ranger Mark Tanaka-Sanders from Hawaii's volcanic Haleakala NP!