3 Refer to the accompanying hypothetical plate map to answer the fol- lowing questions:
a. How many portions of plates are shown?
b. Explain why active volcanoes are more likely to be found on conti-
nents A and B than on continent C.
c. Provide one scenario in which volcanic activity might be triggered
on continent C.

climate change and pollution

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.