Similarities Between Creation Myths

The most common themes I remember from all the creation myths told in class were Earth diver, one or two creators, and Earth existing with no land/life. Earth diver myths typically had some sort of creature dive down to the bottom of the primordial ocean to fetch some dirt/sand that would turn into all of the land. Most of the myths also had one or two deities that would create the world and/or life either from thought or form life out of organic matter on earth including themselves. Every myth set time as before life, time, or light. Earth was usually in existence; however, there would be no land or life, just a primordial ocean.