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                            Antiquated documents and mythologies are also reticent 
                            on the causes which led to the destruction of the 
                            former civilizations. Instead they merely narrate 
                            the events, affairs and the conquests of their times. 
                            Then there are works produced by the courtiers and 
                            written in praise of the ruling elite with details 
                            of wars and conquests, overlooking some very vital 
                            aspects of life. In addition, there are the mythologies. 
                            But in this age of science what we actually need is 
                            a critical evaluation of facts, duly ascertained by 
                            the experts in the light of the scientific analysis 
                            which would ultimately inform us about what really 
                            destroyed the earlier civilizations. 
                             
                         
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                            The remains of the bygone civilizations are found 
                            on three levels. A few ruins are still on the surface; 
                            some went under the ground while others are under 
                            water. In every part of the world the specialists 
                            are working on all the three levels. Nowadays through 
                            the satellites the search in this field has become 
                            all the more easy and the human knowledge has been 
                            breaking bounds ever since. 
                             
                         
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                              We are not certain about the exact number of the 
                              lost civilizations whether under the ground or under 
                              water. We have come to know of only a few of them 
                              through the latest archeological excavations, tourism 
                              and the satellites. It is obvious that a lot more 
                              is buried deep underneath. However the architectural 
                              or the residential monuments, be it pyramids of 
                              Egypt, caves of Ajanta, Ellora or pillars of Rome, 
                              provide us only a partial glimpse of their own age 
                              but enhance our appetite to probe further. 
                           
                         
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                            Nearer 
                              home, in the Indian subcontinent we find Mohenjo-Daro, 
                              Ajanta-Ellora, Dwarka etc. but we have failed to 
                              know till this day how a whole lot of civilization 
                              or a complete culture disappeared off the face of 
                              the earth. The studies carried out so far reveal 
                              that the following features were common to all those 
                              razed civilizations: - 
                               
                              
                                 
                                   
                                      1) 
                                        On the eve of destruction all the civilizations 
                                        were at their zenith.  
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                                  | 2) 
                                    Luxuries were abundantly available. | 
                                 
                                 
                                  | 3) 
                                    Multifarious modes of worship were common 
                                    to all.  | 
                                 
                                 
                                  | 4) 
                                    Pervasive social & religious oppression 
                                    was prevailing.  | 
                                 
                               
                               
                               
                               
                           
                         
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