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In 1580, Bernard Palissy was the first man to describe the present day concept of ‘water cycle’. He described how water evaporates from the oceans and cools to form clouds. The clouds move inland where they rise, condense and fall as rain. This water gathers as lakes and streams and flows back to the ocean in a continuous cycle. In the 7th century B.C., Thales of Miletus believed that surface spray of the oceans was picked up by the wind and carried inland to fall as rain. In earlier times people did not know the source of underground water. They thought the water of the oceans, under the effect of winds, was thrust towards the interior of the continents. They also believed that the water returned by a secret passage, or the Great Abyss. This passage is connected to the oceans and has been called the ‘Tartarus’, since Plato’s time. A great thinker of the eighteenth century, Descartes, agreed to this view. Till the nineteenth century, Aristotle’s theory was prevalent. According to his theory, water was condensed in cool mountain caverns and formed underground lakes that fed springs. Today, we know that the rainwater that seeps into the cracks of the ground is responsible for this. The Qur’aan in the following verses describes the water cycle: "Seest thou not that Allah Sends down rain from the sky, and leads it through springs in the earth? Then He causes to grow, Therewith, produce of various Colors." [39:21] "He sends down rain from the sky and with it gives life to the earth after it is dead: Verily in that are Signs for those who are wise." [30:24] "And We send down water from the sky according to (Due) measure, and We cause it to soak in the soil; And We certainly are able to drain it off (with ease)." [23:18] No other text dating back 1400 years ago gives such an accurate description of the water cycle.