Final answer:
The term that describes a soil layer deposited after a flood is al`lu`vium.
Step-by-step explanation:
The term that describes a soil layer deposited after a flood is al`lu`vium. Al`lu`vium is the sediment or soil that is deposited by flowing water, such as rivers, during a flood. It typically consists of a mixture of sand, silt, clay, and organic matter, and is known for its fertility.
In summary, al`lu`vium is the term used to describe the soil layer deposited after a flood. It consists of a mixture of sediments carried by flowing water during the flood, including sand, silt, clay, and organic matter. Al`lu`vium is fertile soil and plays an important role in supporting plant growth.