Re: Proposed Rule of Thumb
"As the Mass increases, the volume to surface are ratio increases and so the thickness of an ocean on the surface decreases - water depth is given by (volume * small percentage)/surface area"
Don't you mean surface INcreases?
"These two effects conspire to make water worlds more likely for high mass terrestrial planets."
Generally I would agree. But Earth is a pretty dense planet- large percentage is iron core.
What would planet larger than Earth but wasn't as dense do to this "equation"?