Well, for one thing, there would be no earthquakes. (I'm actually in this unit in my science class.) But there would also be no plate motion. If we started this Earth with no plate movement, really no plates at all, we might sink into the Mantle. Or, maybe would step somewhere, and the ground beneath us would give way to the weight. Like the GPGP (Great Pacific Garbage Patch), we might just float around the ocean. Plates are very important.
When you do that the fish will die. That is because it will take too much water in it and die from it, or rather, the fish's cells will take too much water in.
