Which statements best describe measuring with a graduated cylinder? all that apply.
a. the liquid in the cylinder normally forms a concave meniscus.
b. the liquid in the cylinder normally forms a convex meniscus.
c. measurement is taken at the bottom of the meniscus.
d. measurement is taken at the top of the meniscus.
e. a graduated cylinder can be used to measure the volume of an irregular solid.
f. a graduated cylinder can be used to measure the volume of a regular solid.

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.