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I would call it a sediment.
clay
Sediment is solid material that is moved and deposited in a new location.Sediment can consist of rocks and minerals, as well as the remains of plants and animals. It can be as small as a grain of sand or as large as a boulder. Sediment moves from one place to another through the process of erosion.
the answer is cooled magma
You would bring it to the surface where the exposed sedimentary rock would be subject to weathering and erosion and the debris from these processes will be sediment once deposited again.
We use the term deposition to describe the process by which sediment is laid down in a body of water. The sediment is said to have been deposited at the bottom of the body of water, and more may follow to build a layer of sediment.
The flood plain. Delta
Sediment
Most of it is trapped at the dam at Lake Nasser. After that it would be deposited when the flow of the river is too slow to carry it and ultimately what is left is deposited in the delta.
deep
at B
Alluvium refers to clay, silt, sand, gravel, or similar detrital material deposited by running water. New alluvium are these sediments that are being deposited right now and older alluvium refers to sediments that were deposited a short while before the new alluvium. For example, a 500 years ago some sediments were deposited in a stream bed and last year more sediments were deposited in that same stream bed. The 500 year old sediment would be older alluvium and the 1 year old sediment would be the younger alluvium.