How Much Water Is There On Earth? Admin at 2:30 pm May 11, 2012 It covers 70% of the planet’s surface, but every last drop of fresh water, sea water, ground water, water vapor and water in biological matter would form a sphere (above) just 1,384km in diameter. ohgizmo/inhabitat/usgs FacebookTwitterPinterestSponsored Link Related posts: Three Things Apple Is Worth More Than Know Your Tabs Bolics How Populous Is China?