Some Miracles of The Quran - 7

RAIN IN MEASURED AMOUNTS

Another item of information provided in the Qur'an about rain is that it is sent down to Earth in "due measure." This is mentioned in Surat az-Zukhruf as follows:

It is He Who sends down water in measured amounts from the sky by which We bring a dead land back to life. That is how you too will be raised [from the dead]. (Qur'an, 43:11)

This measured quantity in rain has again been discovered by modern research. It is estimated that in one second, approximately 16 million tons of water evaporates from the Earth. This figure amounts to 513 trillion tons of water in one year. This number is equal to the amount of rain that falls on the Earth in a year. Therefore, water continuously circulates in a balanced cycle, according to a "measure." Life on Earth depends on this water cycle. Even if all the available technology in the world were to be employed for this purpose, this cycle could not be reproduced artificially.

Even a minor deviation in this equilibrium would soon give rise to a major ecological imbalance that would bring about the end of life on Earth. Yet, it never happens, and rain continues to fall every year in exactly the same measure, just as revealed in the Qur'an.

The proportion of rain does not merely apply to its quantity, but also to the speed of the falling raindrops. The speed of raindrops, regardless of their size, does not exceed a certain limit.

Philipp Lenard, a German physicist who received the Nobel Prize in physics in 1905, found that the fall speed increased with drop diameter until a size of 4.5 mm (0.18 inch). For larger drops, however, the fall speed did not increase beyond 8 metres per second (26 ft/sec). (Keith C. Heidorn, Ph.D., "Philipp Lenard: Brushing the Teardrops from Rain") He attributed this to the changes in drop shape caused by the air flow as the drop size increased. The change in shape thus increased the air resistance of the drop and slowed its fall rate.

As can be seen, the Qur'an may also be drawing our attention to the subtle adjustment in rain which could not have been known 1,400 years ago.

THE QUIVERING AND SWELLING OF THE EARTH

And you see the earth dead and barren. Then, when We send down water onto it, it quivers and swells and sprouts with luxuriant plants of every kind. (Qur'an, 22:5)

The Arabic word for "quivers" is "ihtazzat," meaning "to set in motion, come alive, quiver, move, stir; the movement and stretching of a plant." The word "rabat," translated as "swells," bears the meanings "to increase, grow in number, swell, grow, develop, rise (of a plant), provision, fill with air." These words describe in the most appropriate manner the changes that occur in the molecular structure of soil during rain.

The motion described in the verse is different from the movement of Earth's crust, such as when a portion of it moves to produce an earthquake, for it is only the soil particles that are moving. These particles are composed of layers, each of which is on top of the other. When water penetrates the layers, it causes the swelling of mud particles. The stages referred to in the verse can be scientifically explained as follows:

1. Quivering of the soil: The electrostatic charge on the particle surface that appears after the water falls on the soil in sufficient amount would cause its instability and quivering movements. This movement is stabilized only after this charge has been neutralized with an opposing one. The soil particle's moving and quivering is also due to its collision with water particles. Since the water particles move in no specific direction, the soil particles move as they are struck from all sides. Robert Brown, a Scottish botanist, discovered in 1827 that when raindrops fall on the soil, they cause a kind of shaking and vibration in the soil molecules. He described this movement of microscopic particles, which today is known as the "Brownian motion." (Brian J. Ford, "Brownian Movement in Clarkia Pollen: A Reprise of the First Observations," The Microscope, 1992, vol. 40, no. 4, pp. 235-241)

2. Swelling of the soil: When it rains, those raindrops hitting the soil cause its particles to swell and increase in volume. This is because when there is abundant water, the space between soil particles, which allows water particles and dissolved ions to enter, increases. When water and the nourishing elements dissolved in it diffuse between the layers, the size of the soil particles increases. Consequently, these particles serve as water deposits that bring the soil to life. It is due to Allah's infinite grace upon humanity that this water is stored in this manner without seeping downward due to the action of gravity. If the soil could not hold water and these mineral deposits could not be laid down in the soil, the water would soak into Earth's deepest parts and, because of its resulting absence, all plants would soon die. However, our Lord has created the soil in such a way that various products can emerge from it.

3. Sprouting of the earth: When there is enough water in the soil, the seeds become active and absorb simple nutritious material. Growing plants meet their water requirements for 2 to 3 months from these deposits.

The above verse describes, in three stages, what happens when rain falls onto dry ground: the soil particles quiver, and the soil swells and then brings forth various products. These stages, which the Qur'an revealed 1,400 years ago, are strikingly parallel to the scientific descriptions. Another verse reveals this about plants:

A sign for them is the dead land that We bring to life and from which We bring forth grain, of which they eat. (Qur'an, 36:33)

RAINS WHICH BRING A DEAD LAND BACK TO LIFE

The rain's function of "bringing a dead land back to life" is indicated in several verses of the Qur'an:
... We send down from heaven pure water so that by it We can bring a dead land to life and give drink to many of the animals and people We created. (Qur'an, 25:48-49)

As well as bringing water, an essential requirement for living things, to the earth, the rain also has a fertilising property. Drops of rain which evaporate from the sea and reach the clouds contain certain substances which "revitalise" dead soil. These raindrops with such "revitalising" properties are called "surface tension droplets." These form from the top layer of the surface of the sea, called the micro-layer by biologists; in this surface layer, less than one-tenth of a millimetre thick, are found large quantities of organic waste formed from the decomposition of microscopic algae and zooplanktons. Some of these wastes collect and absorb elements such as phosphorus, magnesium and potassium, which are rarely found in sea water, as well as heavy metals such as copper, zinc, cobalt and lead. Seeds and plants on the surface of the Earth receive large quantities of the mineral salts and elements they need to grow from these raindrops. The Qur'an refers to this in these terms:

And We sent down blessed water from the sky and made gardens grow by it and grain for harvesting. (Qur'an, 50:9)

These salts which descend with the rain are examples in miniature of fertilisers traditionally used to enhance productivity (calcium, magnesium, potassium etc.). Heavy metals of the kind found in aerosols create elements which increase productivity during growth and production of plants. In short, rain is an important fertiliser. With the fertiliser provided by rain alone, within a hundred years, a soil of poor quality can obtain all the elements necessary for plants. Forests also grow and are nourished with help from these chemicals which originate from the sea.

In this way, every year some 150 million tons of particles of fertiliser fall to earth. Were it not for this fertilising function, there would have been far fewer plants on the Earth and the balance of life would have been disturbed. The information about the revitalisation of plants in the verse is just one of the countless miraculous properties of the Qur'an.