91.35.-x Earth`s interior structure and properties
91.40.-k Volcanology (see also 91.30.Tb Volcano seismology)
91.45.-c Tectonophysics
91.50.-r Marine geology and geophysics
91.55.-y Structural geology
91.60.-x Physical properties of rocks and minerals (for rheological properties of geological materials, see 83.80.Nb)
91.62.+g Biogeosciences (see also 91.67.Uv Organic and biogenic geochemistry; 92.20.Jt Biology of the ocean; 91.80.Kc-in Geophysics Appendix)
91.65.-n Mineralogy and petrology
91.67.-y Geochemistry (see also 92.20.Cm Chemistry of the ocean; 92.40.Bc Chemistry of fresh water; 92.60.Ls Ion chemistry of the atmosphere; 91.62.Kt, 91.80.Kc, and 92.20.C- in Geophysics Appendix)
91.70.-c Information related to geologic time
91.80.+d Geochronology (see also 92.30.Hj-in Geophysics Appendix)
91.90.+p Other topics in solid Earth physics (restricted to new topics in section 91)