According to the mantle plume hypothesis explaining the calderas southwest of Yellowstone National Park, if the calderas are progressively older in one direction, this suggests
the plume is moving through the mantle underneath the stationary tectonic plate in the direction the calderas get younger
the tectonic plate moving over the stationary plume is traveling in the direction the calderas get younger
the plume is moving through the mantle underneath the stationary tectonic plate in the direction the calderas get older
the tectonic plate moving over the stationary plume is traveling in the direction the calderas get older
all of the above
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