What force draws the matter in an interstellar cloud together to form a star? question 4 options: electric gravity magnetism friction

Gravity draws the matter in an interstellar cloud together to form a star.

Option B, Gravity

Explanation:

Due to gravity, the matter with in the interstellar cloud collate together to form star.

A star form when the interstellar gas or dust (molecular dust) comes closer to form dense part under the influence of their own gravity. The core of a gas cloud is dense and hence it collapse first to form clump and then the outer gas collide to form more clumps. These clumps then get collate and get converted into protostars and later turn into fully developed star.

Hence, option B is correct

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.