Wally is a planetologist in the future. He discovers a planet similar to Earth that has two major oceans. Ocean A is very large and looks like it has baseball stitches down its center. Ocean B is very small and has volcanoes all along one side. Wally needs to predict what the planet will look like far into the future. Which prediction would most likely come true?

The “baseball stitches” along Ocean A suggest a mid-ocean ridge, where new ocean floor forms and pushes the seafloor apart, so Ocean A is likely to get bigger. Volcanoes along one side of Ocean B suggest a subduction zone, where oceanic crust sinks beneath another plate; this consumes ocean floor, so Ocean B is likely to shrink. Therefore, the most likely prediction is that Ocean A will get bigger and Ocean B will shrink.

AI-written and checked against the verified answer.