natural action vs physical change

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