Question

in what way does loess contribute to the flooding of rivers? a it constantly raises the bed of the rivers. b it creates new paths for new rivers. c it creates earthen dams on rivers. d it erodes land around the rivers.

Explanation:

Loess is a type of wind - blown silt. When loess is deposited in river beds, it gradually accumulates and raises the river bed. A raised river bed reduces the river's capacity to hold water, making it more likely to flood. Option B is incorrect because loess doesn't create new river paths. Option C is wrong as loess doesn't form earthen dams on rivers. Option D is incorrect because loess deposition (not erosion related to flooding in this context) is the key factor, and loess mainly deposits in river beds rather than eroding the land around rivers to cause flooding.

Answer:

A. It constantly raises the bed of the rivers.