Ms. Bradley’s class is doing a science experiment in class today. During the experiment you will need to record the smell the fumes from some of the chemicals. According to safe practices for laboratory experiments, what should you do when smelling the fumes? Add water to the chemicals before smelling them.
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Inhale the fumes directly.
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Heat the chemicals to boiling before smelling.
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Cup your hand and waft the fumes towards your nose.

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.