A River not only create conditions for settlement of the people on its banks, it sustains the people living near it. It provides them with all the things of human requirements. Water for washing, irrigation, fish. It had been held in great esteem by many civilizations. Rivers are revered because they nourished the life. Many saints and great men loved to live on its banks.
Rivers are held in great esteem in Sikh religion. The region where the religion flourished is aptly called the land of five Rivers.
First Guru Nanak is said to have experienced enlightenment after a dip in holy river. Legend is that when he emerged out of river Kali Bein which merges into the confluence of Beas and Satluj rivers at a place called Harike in Punjab after three days, he was glowing and a completely transformed. He recited the “mool mantra” .
It seems that Guru Gobind ji, the tenth and last Guru had a great affinity for rivers. His Life revolved along the different riverbanks of India.
He was born in Patna and spent his early days on Ganga river.
Then he came to Anandpur sahib which has Satluj river close by. And during wars with hill royalties he stayed in Paonta sahib on the Yamuna river and wrote prolifically.
And then finally he moved to Maharashtra where he stayed on the banks of godavari river.
Alas , due to the unlimited greed of some people, these rivers are being contaminated by discharging the effluents from factories, city sewage and sand mining.
It is the winter season here in North India. The place where I live is adjoining the hills of Himachal Pradesh. During severe winters, many birds from these hill areas come down to adjoining plains which are relatively warmer.
There is a forest near my residence. These days lots of Alexandrine Parakeets and Rose Ringed Parakeets are present in this forest. Their flocks fly from one tree to another searching for the cavities in the tree branches for making nests.
Baya Weavers are small birds of house sparrow size. The scientific name is Ploceus philippinus. What separates them from other birds is the beautiful nests they weave from the grass stalks, mud blobs.
The name weaver itself justifies the mastery is weaving very elaborate and elegant nests hanging from the branches of very high palm trees, thorny acacia trees. Usually these trees are near the water pools, scrub grasses where they are safe from predators.
It is male domain entirely to make the nest. When it is in the almost halfway stage, they invite the females by flapping their wings and if the female approves the nest, it means that she will reside with the particular male, mate and raise the new chicks. If she doesn’t approve, the structure will be abandoned and weaver will feel dejected and sometimes tore away the nest. It starts making newer one.
These birds come to our area in North India, at the peak of summers and by the onset of monsoon rains, have their nests completed. They visit the fields for foraging the seeds both raw and fallen after ripening.
After monsoons, and winter coming, they migrate to slightly warmer areas like western India where food is available and weather is not harsh.
The birds are gregarious and live in flocks. They can be located from the noises they make.
Weaver Birds visit our area when summers are at peak. They stay here, make beautiful nests using the grass stalks and mate and raise the chicks for new generation. Most common are Baya Weavers which make nests on the acacia, palm trees which are difficult for predators to approach.
Birds choose the places to nest in the area where food and water is available and safe from disturbances.
But there is another variety called Black Breasted Weaver. It is master strategist in the choice of the area fulfilling all three criteria. They make different kind of nests and use the long grasses to hang the nests. I accidentally discovered the nest while stopping on the scooter near a roundabout near Ghaggar river bridge in Panchkula Haryana of India.
On the side of road are trenches and crests and a water pool, I saw the nest last year. This year also I saw these nest almost in the same spot. Area is very difficult to approach. I somehow approached at not so favourable distant but still very far for better pictures of this small beautiful bird. It makes nest if the tall reed grass and so much camouflaged that you cannot see it clearly. Only once or twice it sat on the top of dry grass.
Scientists have marked the time since the Earth began its life. They have divided it into different Epochs, Periods, Eras and Eons progressively in increasing time groups.
We are living in the following division of time.
Holocene epoch began roughly 11700 years back and continues till present. United States Geological Survey (USGS) has divided this time into three ages namely
Greenlandian: 11700 to 8326 years ago
Northgrippian: 8326 to 4250 years ago
MEGHALAYAN: 4250 to present date
MEGHALAYAN age marks the time when a mega drought devastated civilizations across the world, including those in Egypt, Greece, Syria, Palestine, Mesopotamia, The indus Valley and the Yangtze valley. Drought lasted some 209 years and supposed to be prompted by shifts in ocean and atmospheric circulation.
Geologists chose the name “Meghalayan” as a nod to a rock sample they analyzed from Meghalaya, a northeastern state in India, whose name means “the abode of clouds” in Sanskrit. By analyzing a stalagmite growing on the ground of Mawmluh Cave, geologists found that each of the stalagmite layers had different levels of oxygen isotopes, or versions of oxygen with different numbers of neutrons. This change marked the weakening of monsoon conditions from that time.
There is a river near Panchkula city of Haryana. It is called Ghaggar. Once a mighty river, now it has become a mere shadow of its past. A thin stream of water flows through the large bed made of sand, pebbles and small amounts of clay. Bushes and different grasses like bulrushes grow in its bed.
Here in the beds near running water one can spot these little cute birds only if you look very carefully on the ground because there colour camouflage them in the sand. They keep standing at a given spot for long time. They become quite fearless and allow you to approach quite nearer.
It is called Small pratincole, little pratincole, or small Indian pratincole (Glareola lactea), is a small wader in the pratincole family, Glareolidae. The birds arrived here about three months ago. They have laid the eggs and raised the new generation They lay eggs in the gravel and sand.
Gold as everyone knows is a noble metal sought after by everyone. By being noble means it is resistant to chemical reactions like corrosion by air and water combination.
The answer tothe question why it has the colour it has lies in electronic configuration of gold atoms. Its electronic configuration is [Xe] 4f14 5d10 6s1 where Xe stands for Xenon. The outermost orbitals are 5d and 6s. There is one electron in the outermost shell. In the geometric structure, atoms are arranged in a particular config And the lone electrons present the 6s orbitals are diffused in the lattice which means that individual electron in a atom has lost the address of parent atom and now belong to the community of gold atoms.
How do the objects we see have different colours? Colours are hidden in white light emanating from the sun. The visible spectrum of light components is composite of 7 colours remembered using “VIBGYOR” where V is for violet and has the maximum energy in the visible spectrum and R is for red with lowest energy.
When it falls on an object, the object absorbs some fraction of the light and reflects the rest of it. Which color or colors wavelengths it will absorb depends upon the unique structure of the object molecules. We see the resultant of colours which are reflected.
In case of gold, the energy difference between the 5d and 6s levels is 2.7 electron volts. The blue light has exactly this energy in its photon packets. So when light falls on it, it completely absorbs the blue fraction of the light. The remains reflected resultant light is exactly the colour which is that of gold.