Calgarypuck Forums - The Unofficial Calgary Flames Fan Community - View Single Post - How much water and atmosphere is there on earth? Cool pic.

evman150 · 02-02-2008, 11:32 PM

I did some very rough back of the envelope calculations and came up with a sphere of radius 800km containing two billion cubic km of water. I used a mean water depth of 5km.

Sounds about right. The 6000 number for the radius of the earth makes the numbers easier and it makes up for the surface area of the land, so they sort of cancel out a bit.

02-02-2008, 11:32 PM	#24
evman150 #1 Goaltender Join Date: Nov 2002 Location: Richmond, BC Exp:	I did some very rough back of the envelope calculations and came up with a sphere of radius 800km containing two billion cubic km of water. I used a mean water depth of 5km. Sounds about right. The 6000 number for the radius of the earth makes the numbers easier and it makes up for the surface area of the land, so they sort of cancel out a bit. __________________ "For thousands of years humans were oppressed - as some of us still are - by the notion that the universe is a marionette whose strings are pulled by a god or gods, unseen and inscrutable." - Carl Sagan Freedom consonant with responsibility.