Wind and rain cause erosion, and alluvial aquifers are the result of erosion. Given these facts, how are alluvial aquifers created among the following options:
- By sand and snow
 - By wind and rain
 - By sunlight and soil
 - By animal activity
 - a hydraulic system
 - Sediment
 - storing water
 - Physical weathering


 

  By wind and rain       