The search results are related to the ocean floor and geological processes, but they do not provide enough information to determine what specific process happens at the side slits. The results suggest that side slits are the result of subduction, which is a geological process where one tectonic plate moves under another plate. However, the results do not explain what happens at the side slits themselves. It is possible that the side slits are simply a feature of the ocean floor resulting from subduction, rather than a process that occurs at the slits themselves.