What will happen to the pacific ocean in 200 millioin years?

The Pacific Ocean is expected to close in the next 200 million years due to the ongoing process known as plate tectonics. As the Pacific Plate moves westward, it will collide with the Eurasian Plate, and the subduction of the Pacific Plate beneath the Eurasian Plate will cause it to sink into the Earth's mantle. This process will result in the formation of new landmasses and the closure of the Pacific Ocean, forming a new supercontinent known as Amasia. The exact timing and details of this process are still being studied and are subject to scientific research and modelling.