A nice successful Earth theory, like a properly running civilization, should have a sustainable recycling system. In plate tectonics the waste-disposal stage corresponds to subduction, the process that takes old plates away from the game of continental drift. We know that while a plate is being subducted the volatile part, mostly water, gets mobilized and rises off the plate to reenter the rock cycle in volcanoes.
The theory of plate tectonics is at the centre of our understanding of how the Earth works. It has been known for decades that new crust is formed at mid-ocean ridges and that this crust is subducted as plates dive underneath other ... Read Post
Seismic measurements show that in some regions of the Earth's mantle, plate tectonics stagnates. The causes of the 'congestion' of the subducted plate are still unknown. In a new study, mineralogists from Germany explain the phenome... Read Post
The current theory of continental drift provides a good model for understanding terrestrial processes through history. However, while plate tectonics is able to successfully shed light on processes up to three billion years ago, the... Read Post