The surface areas of four solutes are 2 mm2, 6 mm2, 10 mm2, and 4 mm2. which solute will dissolve the quickest?
a. 2 mm2
b. 4 mm2
c. 6 mm2
d. 10 mm2

I believe the answer is: d. 10 mm2

To dissolve, the molecule of the solute need to contact the with the solvent. Assuming the solute is drown completely. the area of contact with the solvent will be same as the solute surface area. Higher surface area will make the solute dissolved with higher speed. Multiple object with smaller size are known to have more surface area that single object with bigger size.

i am going to guess that it is co2.

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.