Depends on the river and where it is. Generally speaking, the river bottom will contain silt, clay, sand, gravels, even possibly boulders.
These kind of materials are known as elements.
There are no rivers on the sun. Any information suggesting otherwise is likely a misunderstanding or misinformation. The sun is a giant ball of gas made mostly of hydrogen and helium, with no solid surface for rivers to form on.
No, rivers are not made out of cells. Rivers are bodies of flowing water that traverse landscapes, formed by the movement of water due to gravity. While living organisms in and around rivers, such as plants and animals, are made of cells, the river itself is primarily composed of water and sediment.
Containers can be made from various materials, including plastic, glass, metal, and paper. The choice of material depends on the purpose of the container and what it will be used to hold or store.
The Bemis Humidifier Filter is made from a number of different materials. It contains They are housed in a plastic casing but the main material of the filter is wick.
Freshwater
its kind of rexin
plastic is the answer .
fefo and estra
Composites
have no clue
Shoes are made from a lot of materials including; rubber, plastic, and cloth. You also have some shoes that are made of leather.
Well the gummy bear is NOT made with a bear it is made out of different materials.
Various metals and wood
Castles are made out of cement and/or brick
Saturn has rings made of rock particles and ice.Those are the materials I am aware of. There can be many more materials.
Today the outer bumper shell is made of plastic. The inner bumper is made of steel or alluminum.