Which process involving earthworms is the primary mechanism for the mixing of stratified alluvial deposits in the alluvial plains of Pakistan?

Explanation

The key soil-forming process in the alluvial plains of Pakistan is homogenization, where earthworms mix and blend stratified alluvial sediments. This contrasts with other processes like soil churning (pedoturbation), clay movement (lessivage), and soil darkening (melanization), which are distinct phenomena.