s1=d1 is soil science [science about earth/soil] based on methodology s3.
dertu2, dertu3 and saske2 subsumed. Soil science studies the soil that occupies the pedosphere, one of Earth's spheres. This is not the same as geology (the lujvo for this should mean planetary+composition+science). The two main branches of soil science are pedology (=terderske; the study of soil in its natural setting) and edaphology (the study of soil in relation to soil-dependent uses). See also tedyske, rokske and kunske.