Age of the Earth research. Most geological samples from Earth are unable to give a direct date of the formation of Earth from the solar nebula because Earth has undergone differentiation into the core, mantle, and crust, and this has then undergone a long history of mixing and unmixing of these sample reservoirs by plate tectonics, weathering and hydrothermal circulation. All of these processes may adversely affect isotopic dating mechanisms because the sample cannot always be assumed to have remained as a closed system, by which it is meant that either the parent or daughter nuclide (a species of atom characterised by the number
What Would We Do Without You? Do Without You?" is a song taken from the Stephen Sondheim musical, "Company". What Would We Do Without You? "What Would We Do Without You?" is the 69th episode of the ABC television series "Desperate Housewives". It was also the twenty-second episode of the show's third season. It was written by Bob Daily and directed by Larry Shaw. The episode aired on May 13, 2007. Ricardo Antonio Chavira submitted this episode for consideration on his behalf in the category of "Outstanding Supporting Actor in a Comedy Series" at the 2007 Emmy Awards. Mike and Susan go out to dinner, the