It is called suspension.
Sediment and small rocks are carried down in the river and are deposited.
sediment
A "towhead" is a small sandbar or islet within a river that is usually covered with thick brush or trees.
The River Severn - but a small part of it is in Wales. The River Thames is the longest wholly within England.
Silt, eroded material, is small enough to be carried by water sources. Typically, a rain storm increases the amount of water flowing across a landscape and saturates the soil; the groundwater flows across the land and into bodies of water such as rivers.
A small island in a river is typically called a "river island" or a "river islet." These landforms are often formed by sediment deposition or erosion processes within the river channel. River islands can vary in size and shape, and they play important roles in the ecosystem by providing habitats for various plant and animal species.
A tiny fragment of heated material is likely an ember. Embers are small, glowing pieces of burning material that result from a fire or combustion process. They can be carried by the wind and pose a fire risk if not properly managed.
Slow moving water will carry materials like sediments off of the rocks on the river bank. Slow moving water might also carry boats for example much more easily that fast moving water.
A small river is a tributary to the larger river.
Small laptops, such as netbooks, are great for travel as they can fit easily within any bag and are able to be carried on to any plane without having to check it.
Most of an organism's DNA is carried by its nucleus. The nucleus contains the majority of the organism's genetic material, organized into chromosomes. Mitochondria also have a small amount of DNA known as mitochondrial DNA.
A river mouth is a portion of a stream where it merges with another stream. Note that here the definition of stream is not "a small river", but "any flowing current within well defined banks."