Question

how is loess beneficial?
○ it grows healthy crops.
○ it prevents wind erosion.
○ it protects land from waves.
○ it decreases the slope of riverbanks.

Explanation:

Loess is a type of wind - deposited sediment. Wind erosion is a process where wind removes soil or sediment. Loess, with its fine - grained nature and ability to form a relatively stable layer, helps in preventing wind erosion.

• Option "It grows healthy crops" is incorrect because loess itself doesn't grow crops; it is a type of soil (sediment) that can be used for growing crops, but the statement is not a direct benefit of loess in terms of its inherent property related to erosion or protection.
• Option "It protects land from waves" is incorrect as loess is related to wind - related processes and not wave - related coastal protection.
• Option "It decreases the slope of riverbanks" is incorrect as loess is not mainly involved in modifying the slope of riverbanks. The main benefit related to loess and its formation/property is preventing wind erosion.

Answer:

B. It prevents wind erosion.