Ganymede appears to own several ocean levels, stacked up with levels of ice between them. The highest level of ice would be the crust, which might be about one hundred fifty kilometers (about 90 miles) thick. The lowest ocean degree may very well be 800 kilometers (about five hundred miles) https://claytontxzzy.affiliatblogger.com/86762964/5-essential-elements-for-best-moons