It is widely appreciated in geophysics that the thermodynamic properties of water need to be better known, and there is a good chance that they will be, as a result of recent advances in the development of three atom pair distribution functions for water by A.H. Narten, W.E. Theissen, and L. Blum (Science, Sept. 10, 1982). Research in atmospherics, oceans, glaciers, metasomatism, and many other areas of geophysics has been subject to a serious limitation, namely the lack of knowledge of the structure of liquid water, H2O. The new results were obtained by means of high-flux neutron diffraction data, which are of considerably higher quality than past data. New distribution functions based on the measurements may lead to development of a more realistic statistical mechanical theory of liquid water.