Does the lower mantle correlate with the upper mantle? Do ridges look like superplume boundaries? Only ~3 hotspots are not near yellow/red. All LIPs backtrack to red. STATISTICS…
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John Woodhouse Symposium Oxford March 2014 Passive upwellings are broad & sluggish, to compensate for narrow fast downwellings Ridge crests occur above ~2000 km broad…