<P> Supercontinents describe the merger of all, or nearly all, of the Earth's landmass into a single contiguous continent . In the Pangaea Ultima scenario, subduction at the western Atlantic, east of the Americas, leads to the subduction of the Atlantic mid-ocean ridge followed by subduction destroying the Atlantic and Indian basin, causing the Atlantic and Indian Oceans to close, bringing the Americas back together with Africa and Europe . As with most supercontinents, the interior of Pangaea Proxima would probably become a semi-arid desert prone to extreme temperatures . </P> <P> According to the Pangaea Ultima hypothesis, the Atlantic and Indian Oceans will continue to get wider until new subduction zones bring the continents back together, forming a future Pangaea . Most continents and microcontinents are predicted to collide with Eurasia, just as they did when most continents collided to Laurentia . </P> <P> Around 50 million years from now, North America is predicted to shift slightly west and Eurasia would shift to the east, and possibly even to the south, bringing Great Britain closer to the North Pole and Siberia southward towards warm, subtropical latitudes . Africa is predicted to collide with Europe and Arabia, closing the Mediterranean Sea (completely closing the Tethys Ocean (or Neotethys) and the Red Sea). A long mountain range would then extend from Iberia, across Southern Europe (the Mediterranean Mountain Range) into Asia . Some are even predicted to have peaks higher than Mount Everest . Similarly, Australia is predicted to beach itself past the doorstep of Southeast Asia, causing the islands to be compressed inland, forming another potential mountain range . Meanwhile, Southern and Baja California are predicted to have already collided with Alaska with new mountain ranges formed between them . </P> <P> About 150 million years from now, the Atlantic Ocean is predicted to stop widening and begin to shrink because some of the Mid-Atlantic Ridge will have been subducted . In this scenario, a mid-ocean ridge between South America and Africa will probably be subducted first; the Atlantic Ocean is predicted to have narrowed as a result of subduction beneath the Americas . The Indian Ocean is also predicted to be smaller due to northward subduction of oceanic crust into the Central Indian trench . Antarctica is expected to shift upwards, colliding with Madagascar and Australia, enclosing a remnant of the Indian Ocean (called the Indo - Atlantic Ocean). </P>

Where on pangea ultima will new mountain ranges form
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