1. (noun) a process existing in or produced by nature (rather than by the intent of human beings)

• action
• activity
• natural action

1. (noun) a process existing in or produced by nature (rather than by the intent of human beings)

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

1. (noun) a process existing in or produced by nature (rather than by the intent of human beings)

• physical process
• process

1. (noun) a process existing in or produced by nature (rather than by the intent of human beings)

• active
• active