Answer by  
                                                                                          ChrisH (53)
                                                            
                          
                          
                                                          Hydroplate theory is one "creation theory" which states that before the Earth as we know it formed, all the water was under the crust of a super-continent. As pressure from the water built up under that crust, it finally erupted out. This caused a huge flood, which created many physical features we now know, and broke the crust into plates.