India's GDP Is Said to Grow at Nine Point Two % This Year

We don't have any evidences of today. But there are possibilities. So one possibility is a global event, a global impact event like the like the hypothetical younger dryas event. Or maybe each of these cultures was founded on major rivers, and every river has a big flood once enouh,. We know, 500 years, a thousand years, or something of that. Maybe that's the reason why there are so many flood stories.