“Water reveals how small our lives are in time as well as space. Less than 0.025% of the water on our planet exists in all the world’s rivers, lakes, marshes and biological {{w|organism}}s combined. A river is water’s chance to flicker and dance under the sun before it returns to the deep, dark ocean, is frozen in {{w|ice}} or stored away underground, sometimes for hundreds of millennia. Flowing water moves mountains, it hollows and builds land. It provides the medium in which the chemistry of life recycles and reorganises energy and matter.”