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alluvial (adj) of soil and sand deposits left on an area by running waters of rivers or floods.
This word is rather technical and is connected with the types of soil. An area covered with the soft mixture of sand and soil thrown up by the flowing waters of rivers or floods is alluvial soil. Alluvial soil is very fertile and helps in farming.
- Crops thrive on alluvial soil even without the help of fertilizers and manures.
- In spite of the alluvial soil, crops this year are withering because of drought conditions.