Earth is not sitting in a body of water. Maybe I'm moving goalposts but c'mon now, this is not what people typically mean by an "island"!
Similarly, my home is not an island even though the air around it contains water vapor. Nor is my home an island because there are some puddles on the street outside.
Similarly, my home is not an island even though the air around it contains water vapor. Nor is my home an island because there are some puddles on the street outside.