"I covered this entire planet once."

I didn't know that and doubted it, so I googled. Link says that before around 1 billion years ago, water (ocean) covered 95% of the surface of the earth, and then continents erupted relatively quickly, geologically speaking.

However, I think that 95% coverage figure (and possibly more earlier on?) would mostly be owed to the crust and mantle being relatively flat and smooth after cooling down from being a largely molten ball very early on. Now that the earth has cooled enough to allow plate tectonics to push stuff around and create subduction zones and mountain ranges, there are too many high-elevation points (and low elevation chasms for the ocean to fill in) for the ocean to ever cover the entire earth again. Even if all of the ice on the earth melted, apparently sea level would only rise by about 70 meters / 230 feet.

So the "and I can always cover it again" bit at the end is a bit overstated. We'd almost certainly be dead as a species if conditions were extreme enough to melt all of the ice around the world, but not because of being drowned off of dry land to live on.

Was thinking the same thing. I once tried to calculate the volume of water that would have to be added to raise sea level to the height of Everest. I can't remember exactly but I think I came up with 3 to 4 times the currently existing volume of the oceans. This was part of an argument against the biblical flood story.

Get off my plane-it!