
credit:
www.usgs.gov/media/images/all-earths-water-a-single-sphere I saw this image as part of some research I was doing on the tale of Noah's Ark. At first I was thought it was a doctored image using a credible sounding webpage. I would have guessed that all the world's water would make up a much greater volume.
I did some checking and it appears that most of the sources I could find reckon the sphere would be 1380 - 1390 km in diameter which is pretty much what the graphic suggests.(Roughly Perth to just past the WA/SA border). The oceans are just a thin film in the grand scheme of things.
Just one of those times when assumption and reality are a bit jarring.
As a little aside, there is simply not enough water on the planet to flood the entire planet to height of Mt Ararat. A local flooding event
is possible, but the geography around Mt Ararat is problematic. There is some suggestion that the Bible tale is borrowed from earlier civilisations and describes a Nile flooding event, or the breaching of the geographic 'Mediterranean' wall from Tangier across to Gibraltar. To those early cultures something of this nature would appear to be universal.