வெள்ளி, 29 நவம்பர், 2019

தொல்தமிழர் அறிவியல் –156 : 50. உலகத் தோற்றம் - ஒடுக்கம்

தொல்தமிழர் அறிவியல் –156 : 50. உலகத் தோற்றம் - ஒடுக்கம்                                                                                                                                                                                                                                                                                      
                           No doubt we’ve all heard of the legend of Atlantis, the ancient, once great city that was lost when the ocean submerged it.

                         To this day the legendary city has yet to be found (or proven to have ever existed) yet over the years many other underwater cities have been found, each of them as eerie as they are mind blowing.

நீரில் மூழ்கி அழிந்தவை

1.   Port Royal, Jamaica
2. The Pyramids of Yonaguni-Jima, Japan
3. Dwarka, Gulf of Cambay, India
4. Lion City of Quiandao Lake, China
5. Cleopatra’s Palace, Alexandria, Egypt
 --- (Earth Porm.com)
இந்தியாவில் மும்பை, கொல்கத்தா ஆகிய இரண்டு துறைமுக நகரங்களும் நீரில் மூழ்குவதற்கான(2070) நிலையை எதிர்நோக்கியுள்ளன .
Earth’s Evolution
                                  Earth and the rest of the solar system formed about 4.6 billion years ago from a huge, spinning cloud of gas and dust. 

                                       Over a period of about 10 million years, the dense center of the cloud grew very hot. This massive center became the sun. The rest of the particles and objects continued to revolve around the sun, colliding with each other in clumps. Eventually, these clumps compressed into planets, asteroids, and moons. This process generated a lot of heat. 

                                        Eventually, Earth began to cool and its materials began to separate. Lighter materials floated upward and formed a thin crust. Heavier materials sank toward the Earth’s center. Eventually, three main layers formed: the core, the mantle, and the crust.

                                As Earth’s internal structure developed, gases released from the interior mixed together, forming a thick, steamy atmosphere around the planet. Water vapor condensed, and was augmented by water from asteroids and comets that continued to crash to Earth. Rain began to fall and liquid water slowly filled basins in Earth’s crust, forming a primitive ocean that covered most of the planet. Today, ocean waters continue to cover nearly three-quarters of our planet.

                                   The end of the Earth will come with the end of the sun. In a few billion years, the sun will no longer be able to sustain the nuclear reactions that keep its mass and luminosity consistent. First, the sun will lose more than a quarter of its mass, which will loosen its gravitational hold on Earth. Earth’s orbit will widen to about 1.7AU. But the sun will also gain volume, expanding to about 250 times its current size. The sun in this red giant phase will drag Earth into its own fiery atmosphere, destroying the planet.
 ------ Wikipedia. ------தொடரும்…

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