River soil composition concept. Woman a scientist takes a sludge sample from a river close up.
Palabras clave
dirtied,
sludge,
water,
pollution,
sample,
analysis,
test,
river,
silt,
mud,
analysing,
exam,
testing,
exam,
scrutiny,
learn,
research,
flask,
female,
hand,
environment,
lake,
duck pond,
holding,
glove,
inspector,
concept,
dirty,
composition,
nature,
ecology,
expertise,
science,
experiment,
chemical
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