Accounting Information

Correct answer: B. A high sediment load relative to carrying capacity and variable discharge

B is correct. A braided river commonly forms when sediment supply exceeds the river’s carrying capacity. Deposited sand and gravel build bars that divide the flow into several shallow channels; changing discharge can shift or reshape these channels and bars.

Correct answer: A. Because water has no external outlet and leaves fine sediment and salts after evaporation

An endorheic basin is a closed drainage basin with no surface outlet to the sea or another drainage system. Rainwater and temporary streams collect in its depression, and in an arid climate much of the water evaporates. Fine clay, silt, and dissolved salts are then concentrated on the flat floor, producing a playa or salt flat. Thus option A is correct; sea waves, permanent glaciers, and salt removal are not required.

Correct answer: A. Because its upper drainage is captured by a stronger neighbouring stream

The correct answer is A. River capture, or stream piracy, occurs when an actively eroding neighbouring stream breaches a divide and diverts the headwaters of another drainage system. The captured upper course then flows into the pirate stream, leaving the former downstream channel with reduced discharge and no original headwaters. This shortened or deprived channel is called a beheaded stream. The other choices describe unrelated coastal, glacial, or aeolian processes.