Summary:
- This article discusses the discovery of the oldest known evidence of plate tectonics, the process that shapes the Earth's surface, in ancient rocks from Greenland.
- The rocks, estimated to be around 3.8 billion years old, show clear signs of plate tectonics, including the presence of subduction zones where one tectonic plate is pushed under another.
- This finding pushes back the timeline of plate tectonics, which was previously thought to have started around 3 billion years ago, and provides valuable insights into the early evolution of our planet.