- abyssal environment
- accidental discharge
- acid aerosol
- acid deposit
- acid earth
- acid fog
- acid neutralizing
- acid particle
- acid precipitation
- acid runoff
- acid stress
- acidic area
- acidic particle
- acidified lake
- acidity level
- acid concentration
- acid lake
- acid loading
- acid pollution
- acid shock
- acid snow
- acid tolerance
- acid-stressed
- acidic precursor
- acute effect
- adaptive process
- aeolian rock
- aerial reconnaissance
- air poisoning
- air pollution
- air drying
- air shed
- ambient atmosphere
- ambient heat
- annual food
- annual flood
- annual flow
- aqueous rock
- artesian spring
- ash fall
- background level
- background pollution
- backhoe
- average precipitation
- average rainfall
- bacteria contamination
- baffle collector
- basicstage flood
- basin pluviometry
- bathyal environment
- basement complex
- beach
- benign
- biochemical tracer
- biocoenosis
- biodegradable substance
- biological agent
- biological degradation
- biological equilibrium
- biological treatment
- biological waste
- biosphere
- bland
- black tide
- black water
- boiling spring
- boom pack
- bottom discharge
- burning behavior
- breaker board
- bulk deposition
- burning agent
- bunker tank
- cargo tank
- catalyst poison
- catastrophic flood
- catchment rainfall
- centrifugal skimmer
- chemical agent
- chronic effect
- clear
- chocolate mousse
- clean snow
- clean-up
- closure flood
- collection
- collection device
- combustible fossils
- combustible waste
- combustion unit
- contaminated mater
- contamination
- continental rainfall
- controlled flood
- corral
- curtain boom
- cumulative rainfall
- daily precipitation
- daily rainfall
- depolluting ship