estuary – n. an area where a river flows into the sea
benefit – v. a good or helpful result or effect
sediment – n. material (such as stones and sand) that is carried into water by water,
muck – n. wet dirt or mud
fragile – adj. easily broken or damaged
zone – n. an area that is different from other areas in a particular way
ecosystem – n. everything that exists in a particular environment
manage – v. to have control of something
source – n. the beginning of a stream or river of water