General Discussion
In reply to the discussion: Massive crack in earth mysteriously opens up in Bighorn Mountains [View all]Mendocino
(8,498 posts)The land-form above it does. There is a trail of past calderas and volcanic activity SW of Yellowstone back to the Nevada-Oregon border region. If this track continues on it's present course, in millions of years, the Winnipeg area of Canada will have magmatic activity.
The same happens in the Hawaiian Island chain. As the Pacific Plate moves over the hotspot, a chain of volcanoes emerge. You can trace this back to the NW for thousands of miles The Big Island is the newest and has the magmatic activity. The others in the chain are older and will eventually erode to virtually nothing. There is an emerging volcanic spot on the seafloor SE of the Big Island. In about fifty thousand years it will break the surface and the building of the newest Hawaiian Island will continue. The Big Islands volcanoes will slow down, become dormant and finally go extinct.