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.
Geophysicists have developed a new theory to explain the global motions of tectonic plates on the earth's surface. The new theory extends the theory of plate tectonics -- a kinematic description of plate motion without reference to ... 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
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