THE 2-MINUTE RULE FOR BEST MOONS

Ganymede appears to have a number of ocean levels, stacked up with levels of ice in between them. The highest amount of ice is the crust, which might be about 150 kilometers (about 90 miles) thick. The lowest ocean level can be 800 kilometers (about five hundred miles) below that, just over the initial layer on the moon’s rocky inside.If you are