Answer;
Rainfall
Rainfall is the greatest influence on soil formation.
Explanation;
- Soil formation results from weathering of rocks or materials deposited by erosion from rivers and wind.
- Soil differs from one place to another due to the influence by factors such as climate, topography, organisms etc.
- The influence from climate is due to temperature and rainfall. High temperatures and rainfall increase the degree of weathering and thus the extent of soil formation.
- Among the factors influencing soil formation climate has the greatest influence.