The rains, the seas, rivers, streams, the oceans, drinkable water that flows when you turn on a faucet... People are so used to the existence of water that they probably never think about the fact that a major part of the Earth's surface -indeed, most of it- is covered with water. However, what is singularly important here is that, among all known celestial bodies, only the Earth provides drinkable water.
Fully four-fifths of the Earth's surface is covered with water. In addition to large water masses such as oceans, there are various other water sources whose sizes and attributes are different from each other, such as rivers and small lakes. Some of these waters are too salty to be drinkable, but others are fresh. There is a perfect water balance that has been arranged according to the needs of all living things on the Earth.
By virtue of water, millions of species of creatures exist on Earth, and the balances that are necessary for life are preserved. For example, clouds and rain are formed by the evaporation of large water masses. Water has a high capacity for drawing and holding heat. For this reason, the large water masses of the oceans and seas maintain the balance of the world's heat. Therefore, the temperature difference between day and night in regions near the sea is very small. This makes these regions more livable.
The existence of the oceans, a bird's-eye view of which is seen at the left of this page, is highly significant. Because the oceans reflect the sun's rays less than land does, they receive more sun energy, yet they disperse this heat in a more balanced way. Therefore, the oceans cool the equatorial regions and prevent them from becoming excessively hot, and also warm the waters of the polar regions to prevent them from freezing completely.
Through the transparency of water, water mosses can photosynthesize under the surface of the ocean. Water is one of the few substances in nature that expands when frozen. It is because of this that the seas and oceans do not freeze from bottom to top.
All of the physical and chemical features of water, of which only a few have been given here, show us that this liquid has been specially created for the needs of human life. It is surely no coincidence that such water is not available on any other planet besides the Earth. The Earth, which has been specially created for human life, has blossomed with life through water, which has also been specially created. Allah, Who has created countless blessings for His servants and bestowed on them an easy mode of living, has created water with unique artistry and delicacy. As He maintains in the Qur'an, "It is He Who sends down water from the sky..." (Surat an-Nahl: 10)