Signs of Allah in Oceans and Lands
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)
The great quantity of water in the seas makes our earth habitable. If the proportion of sea to land on the earth were smaller, then lands would turn into deserts and life would be impossible.
A conscientious person who thinks about these matters is completely convinced that the establishment of such a perfect balance on the earth is surely not a coincidence. Seeing and thinking about all these shows that a Creator Who is exalted and the owner of eternal power created everything for a purpose.
And He has made everything in the heavens and everything on the earth subservient to you. It is all from Him. There are certainly Signs in that for people who reflect. (Surat al-Jathiyya: 13).