Let's turn our eyes from the Earth to space. It is possible too to find water there: ice caps on the poles of Mars, satellites of Jove, completely covered with ice, Saturn and other planets, ice rings around Saturn, ice nucleuses of comets, which existence is confirmed experimentally during the research of a comet of Galley under the project of Vega, vapour of water in an atmosphere of Venus... So, there is a lot of water in space around us, but this water differs from terrestrial one by the fact that on a surface of planets and other heavenly bodies it exists only in firm or vapour condition. However, in ice of the bowels of the satellites of Jove - Europe, Ganimed and Callisto - it is possible to assume existence of water-ice area in the case that there is a thermal flow from the bowels there.
The large prevalence of water in space and in particular ice in such primary formations as comets and comet-looking bodies, proves that the structure of primary substance of our planet should have included molecules, and rather large ice objects and, certainly, the hydrogen and oxygen. Therefore already at the very first stages of evolution of the Earth water should exist on its surface and in the bowels as ice inclusions.
