The Nile Deposit is a term used to describe the sediment that accumulates at the mouth of the Nile River. This sediment is composed of two main components: DELTA (5 letters) and SILT (4 letters). DELTA is a triangular-shaped deposit of sediment that forms at the mouth of a river, while SILT is a fine-grained sedimentary material that is carried by the river and deposited in the DELTA. Together, these two components form the Nile Deposit, which is an important part of the ecology of the Nile River.