natural process

active

physical process, process

absorption, acidification, adiabatic process, aeration, antiredeposition, capture, cataphoresis, centrifugation, chemical action, chemical change, chemical process, chromatography, clotting, coagulation, concretion, condensation, convection, curdling, curing, decay, demagnetisation, demagnetization, desorption, dielectrolysis, diffusion, disintegration, dissolution, distillation, distillment, drift, ecesis, ecological succession, effervescence, electrophoresis, establishment, extinction, extraction, feedback, filtration, flocculation, flow, formation, fossilisation, fossilization, geologic process, geological process, hardening, inactivation, ion exchange, ionisation, ionization, ionophoresis, leach, leaching, magnetic induction, magnetisation, magnetization, materialisation, materialization, natural selection, nuclear reaction, opacification, oscillation, oxygenation, pair creation, pair formation, pair production, phase change, phase transition, physical change, precession of the equinoxes, radiation, release, rigidification, rigidifying, saltation, scattering, selection, sericulture, set, sink, soak, soakage, soaking, softening, solidification, solidifying, sorption, source, state change, stiffening, stimulation, succession, survival, survival of the fittest, synergism, synergy, temperature change, transduction, transpiration, vitrification