Visualisation of the distribution (by volume) of water on Earth. Each tiny cube (such as the one representing biological water) corresponds to approximately 1000 cubic km of water, with a mass of approximately 1 trillion tonnes (200000 times that of the Great Pyramid of Giza or 5 times that of Lake Kariba, arguably the heaviest man-made object). The entire block comprises 1 million tiny cubes. Data is from <a rel="nofollow" class="external free" href="https://ga.water.usgs.gov/edu/waterdistribution.html">http://ga.water.usgs.gov/edu/waterdistribution.html</a> .
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