This is in continuation of Human migration in the world.
This, based on Vishnu Purana, briefly explains the cataclysmic events that struck/strike the earth.
Earth becomes habitable after this.
It is worth noting that Hinduism believes in te Nn Linear theory of Time, tat is the Cyclic Theory, which means that there is nor beginning and no end and that Time is eternal;as such events keep on happening with regularity.For more read my post Time, Non Liner,Cyclic.
There are three type of cataclysms described in the Vishnu Purana, all the Puranas declare the same, with no variations.
This takes place at the end of Lord Brahma‘s Day, One Kalpa.
This is equivalent to 4.32 billion human years.
At the end of this period dissolution starts.
During the last Hundred Years(Human), there will be severe Drought.
Living Beings shall become ver weak.
Lord Vishnu, in the form of Rudra unsettles the Living Beings.
The Seven rays of the Sun become too long(Infrared?)
Water will be sucked out of the earth.
The seven rays are.
The world shall be enveloped in fire.
Excepting evolved souls all others shall perish.
Of the evolved souls, Brahma Gnanis shall reach Brahma Loka through Satya and Thapo Loka.
The ruling class of Manu dynasty, shall go first toMahar Loka:finding tat to be too hot, they shall reach Jana Loka along with Mahar Loka residents.
This is naimithika Pralaya.
This takes place at te end of Brahma’s Life cycle.
This is two parathas, equivalent to 10 to te power of Eighteen years(Human)
That is at the end of 200.000,000,000,000,000 Years.
Current estimate of Earth.
The Earth is a little over 4.5 billion years old, its oldest materials being 4.3 billion-year-old zircon crystals. Its earliest times were geologically violent, and it suffered constant bombardment from meteorites. When this ended, the Earth cooled and its surface solidified to a crust – the first solid rocks. There were no continents as yet, just a global ocean peppered with small islands. Erosion, sedimentation and volcanic activity – possibly assisted by more meteor impacts – eventually created small proto-continents which grew until they reached roughly their current size 2.5 billion years ago. The continents have since repeatedly collided and been torn apart, so maps of Earth in the distant past are quite different to today’s.
So there are Four Cataclysmic events involving Water on the Earth and let us see how this is reflected in Tamil and Sanskrit literature.
There is a major differnce between Naimithika Pralaya and Prakrutha Pralaya.
I shall be posting on this in detail.