cornerstone, pillars, foundations, backbone, keystone, core, sedimentary rock, underpinning, colluvium, sandstone, igneous rock, lifeblood, substrata, diabase, limestones, dolomite, outcrop, eluvial, linchpin, claystone, dolerite, graben, stratum, schist, values, sedimentary, alluvium, archaean, metamorphic rock, phyllosilicate, basalt, loess, overburden, sediments, volcanic rock, argillaceous, hardpan, gabbro, lithosphere, amphibolite, rocks, granite, fissures, norite, buttresses, lode, anticlines, gneiss, evaporite, zechstein, clastic, outwash, diamondiferous, andesite, asthenosphere, lineaments, talus, footings, subducting, tensional, depositional, principles, seeps, vein quartz, greywacke, hornblende, fundament, saprolite, subsurface, craton, lower carboniferous, concretion, turonian, soil, silty, schistose, touchstone, esker, lodestone, eclogite, aluminous, arenite, silicic, goethite, argillite, dacite, fissions, monolith, moraine, roots, tenet, syncline, anastomosing, wellspring, palaeozoic, granodiorite, tremolite, sands, surface, lithology, peridotite, lynchpin, rock, substratum, foundation, groundwork, igneous, substructure, moorings, rationale, wellsprings, antithesis, coherence, fundamentals, grounding, mainstay, principle, underpinnings, dipping, pennsylvanian, sheared, basement, cambrian, cladding, cretaceous, crust, electrolyte, faulted, intermetallic, lacustrine, mantle, membrane, ordovician, oxic, permian

conservation, conservation law, first principle, rudiment

c-horizon, c horizon, subsoil, undersoil

principle, rock, stone

basic principle, basics, fundamental principle, fundamentals