No doubt that RAM SETHU IS MAN MADE.Otherwise how to explain the fact that Natural Extension of the Land on the Indian side is EXACTLY joined to the Natural Extension on the Lankan Side? Also this is the SHORTEST POSSIBLE between the two lands. If it is 'Natural" one could as well assume a "any house in a city " is Naturally formed ,that is,if you calculate the probability and Coincidences in this case .
Again,according to reports that came in Rediff in July end,the chemistry/constitution of the boulders found on the Sethu does not represent that of the surrounding marine geology. The boulders have constitution resembling that is found in the LAND farther inside. Kilometers of Boulders laid on the bridge to connect two natural protrusions of India and Lanka with the LEAST EFFORT PRINCIPLE (ie to reduce labor by connecting the land extension which will bridge the shortest distance) IS DEFINITELY THE RESULT OF WELL CONSIDERED PLANS THAT ONLY HUMANS CAN THINK OF.
Hence the MOST SCIENTIFIC Conclusion: RAM SETHU IS MAN MADE. ANY MUD HEADED CHALLENGERS ???