Which one of the following is a gravity transported soil?

Which one of the following is a gravity transported soil?

Alluvial
Eolian
Colluvial
Glacial
This question was previously asked in
UPSC Geoscientist – 2023
The correct answer is Colluvial.
Colluvial soil is soil that has been transported and deposited by gravity. This occurs on slopes where material moves downwards due to processes like creep, landslides, rockfalls, and sheetwash.
Alluvial soil is transported by flowing water (rivers, streams). Eolian soil is transported by wind (e.g., loess, sand dunes). Glacial soil is transported by glaciers (e.g., till, moraines).