Although on a human scale it may seem immobile, the Earth is in constant transformation. Beneath the surface, tectonic plates move as naturally as the planet rotates on its axis and orbits the Sun. Therefore, the current continents are merely a transient image within a much broader geological cycle that could give rise to a future supercontinent.
Moreover, the continental masses that today delineate oceans and political boundaries are part of a deep process that does not stop. Consequently, in about 200 million years, they could reunite into a single landmass. When that happens, the known map will be completely different.
In this context, research published in the journal Geological Magazine suggests that continental drift is advancing towards a new reunification. Based on three-dimensional climate models developed at the NASA Goddard Institute and the University of Lisbon, it is warned that this process will extremely alter the global climate.
Four paths to a new supercontinent
Scientific literature identifies four possible scenarios: Novopangea, Pangea Proxima, Aurica, and Amasia. Each depends on which oceans open or close and how current subduction zones evolve. Thus, the fate of the continents is tied to invisible but persistent dynamics.
In the Novopangea model, the Pacific Ocean continues to close while the Atlantic expands. The Pacific, surrounded by the Ring of Fire, concentrates 80% of the planet’s major earthquakes. In this context, America would end up colliding with an Antarctica displaced northward.
Meanwhile, Pangea Proxima proposes the closure of the Atlantic and the reunion of America with Europe and Africa. Aurica suggests the simultaneous closure of the Atlantic and the Pacific, with continents concentrated around the equator. Finally, Amasia predicts the closure of the Arctic Ocean and continental migration towards the North Pole.
Climatic and ecological consequences
Each configuration would imply profound environmental transformations. In the case of Aurica, simulations estimate a global average temperature of 20.6 °C, much higher than the current 13.5. The reduced presence of polar ice would decrease the albedo and increase the absorption of solar radiation.
In contrast, Amasia would favor the accumulation of snow and ice at high latitudes. The increase in albedo would generate an estimated average temperature of 16.9 °C, although accompanied by massive glaciations. Consequently, the deep ocean circulation would also be altered.
Furthermore, a single supercontinent would imply fewer coasts and more continental interior, with extreme climates. Species would face new competitions and possible mass extinctions. Thus, biodiversity would be subjected to unprecedented pressures.
The “Supercontinent” theory and its lessons
The supercontinent theory holds that Earth undergoes cycles of fragmentation and reunification every hundreds of millions of years. Pangea was the last great unified block, and its breakup gave rise to the Atlantic and the current continental relief. Therefore, the present is merely an intermediate stage.
Additionally, regions like the Iberian Peninsula retain traces of those ancient collisions in structures like the Hesperian Massif and the Central System. These geological formations are evidence that continents change and reconfigure continuously.
Ultimately, understanding these cycles allows us to gauge the fragility of climatic balances. Although these changes will not occur on human scales, the plates continue to move centimeters each year. Thus, continental drift continues, silent but constant, reminding us that everything on Earth is in motion.
