Which of the following phrases describes a typical river mouth? a. clearer water with high levels of oxygen b. decreased vegetation and lower oxygen levels c. increased species diversity d. high levels of vegetation

The correct answer is B. Decreased vegetation and lower oxygen levels.

The density of the river is what influences the motion of the river. The motion of the river are being compared to rotation of earth, ambient motion which is found in part which is receiving water. For example, seiches and tides.

A river will definitely plunge below the surface if water which is in the river has higher density comparing to the receiving water surface.

The answer for this question is "B".

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