The surface of mars has long channels that may have been caused by flowing water. true or false?

The given statement is True.

The water on mars today exists in the form of ice. The pressence of channels on mars can only be a result of flowing water. Geologic evidences shows that mars has enormous outflow channels which are carved by floods, ancient river valleys, deltas, etc. There are some evidences of rocks that are only found in water which proves the pressence of water on mars.

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.

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