Rebecca wants to know the density of a penny. She knows that the mass of a penny is 3 grams. Next, she needs to measure the volume. To do that, she uses a graduated cylinder to find the displacement of water after the penny is dropped into the cylinder. Her results are provided. Volume of Water Before the Penny Was Dropped In: 30 mL
Volume of Water After the Penny Was Dropped In: 31.5 mL

Based on the provided data, Rebecca can conclude that the density of the penny is which of the following?

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.