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(chemistry) precipitation / settlement (e.g. of sediment)
I observed precipitation in a chemistry experiment.
precipitate / settle
In this chemical reaction, the substance precipitates.
observe
He was observing the behavior of the birds.
observation
He was observing the behavior of birds.
chemistry (branch of natural science)
He is majoring in chemistry at university.
experiment
We conducted a new experiment in science class.
to do an experiment
We will conduct a new chemistry experiment tomorrow.
He is an expert in chemistry.
probation
He committed another crime while on probation.
birdwatching
I often go birdwatching in the park on weekends.
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