Question

what is Alluvial and Clayey soil ?

Answer 1

alluvial soil - a fine-grained fertile soildeposited by water flowing over flood plains or in river beds. alluvial deposit,alluvial sediment, alluvium, alluvion -clay or silt or gravel carried by rushing streams and deposited where the stream slows down.
Clay is a finely-grained natural rock or soilmaterial that combines one or more clayminerals with traces of metal oxides and organic matter.

Geologic clay deposits are mostly composed of phyllosilicate minerals containing variable amounts of water trapped in the mineral structure….

Answer 2

Alluvial soils is sand left behind on land which has been a river once flowed.