Question

what is the most effective way to protect dry lands from desertification?
○ terrace farming
○ mine digging
○ planting a tree belt
○ constructing a dam

Explanation:

Terrace farming reduces erosion on sloped farmland but is not the most effective for broad dryland desertification. Mine digging damages soil and worsens desertification. Dams manage water but do not directly prevent dryland degradation. Tree belts create windbreaks, hold soil, and retain moisture, directly combating desertification in dry lands.

Answer:

planting a tree belt