தொல்தமிழர் அறிவியல் –117 : 40. வடவைத் தீ - முகாக்கினி
A mid-ocean ridge is an underwater mountain system formed by plate tectonics. It consists of various mountains linked in chains, typically having a valley known as a rift running along its spine. This type of oceanic mountain ridge is characteristic of what is known as an oceanic spreading center, which is responsible for seafloor spreading. The production of new seafloor results from mantle upwelling in response to plate spreading; this isentropic upwelling solid mantle material eventually exceeds the solidus and melts. The buoyant melt rises as magma at a linear weakness in the oceanic crust, and emerges as lava, creating new crust upon cooling. A mid-ocean ridge demarcates the boundary between two tectonic plates, and consequently is termed a divergent plate boundary.
tt “ The extract from Patirupathu-62 speaks about a mysterious fire that generates from underneath the ocean to offset the fury of water that surges and overflows from sub-terranean sources.
Fire from the deep ocean-bed and the fountain of water from the watery depth may seem incredible to commoners. But a news item from The Hindu, Trichy Edition dt. 16 – 11 – 2015, speaks about mid-ocean ridges and tectonic plates that erupts magma and lava from under-sea mountain ranges.
A similar report about these mountains under the sea appeared in BBC web site also.
Comparable to these is that recent occurrences of Tsunami are actually because of a earth quake under the deep waters of oceans.The passage from Sangam literature ensures that even rare geological facts were not unknown to ancient Tamil poets.—Editor. ------தொடரும்….