River soil composition concept. Woman a scientist takes a sludge sample from a river close up.
Keywords
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