Which of the following practices involve the planting of crops on terraces or steps built on the slope of a mountainside? a. contour plowing
b. crop rotation
c. rip rapping
d. terracing​

Terracing

Explanation:

Terracing is very popular in Urban areas, but also in areas where flat land is scarce, it is essentially where you create a raised platform to grow crops on.

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.