They look different because when a rock is at the beginning of a river they havent barely started their journey yet so they're probably a lot bigger and not so crucked as to when they are at the bottom after they have fallen got scratched and had bits chipped off of them ...
That would be the Indus River.
A river would be the Ganges.
Because the river attached to the Sea and then all the rocks or the seashells would go with the river. Tip: river is like a stream.It moves.
rocks?
Rocks found in a river bed are typically rounded and smooth due to the erosion caused by the flowing water. These rocks are often composed of hard, durable materials like quartz, granite, or basalt.
ever since people would start throwing away stuff, like in the beginning of the 1900s.
a river
River islands are typically formed through a process called river avulsion, where a river changes its course and leaves behind sections of land surrounded by water. This can occur due to erosion, sediment deposition, or changes in water flow. Over time, vegetation may start to grow on these stranded land sections, eventually forming river islands.
as every river is different, it would depend on which river and the draught of that river or the amount of water displaced by a boat on that river
Depending on the minerals in their composition, some rocks are harder than others. Rocks that contain minerals with higher ratings on the Mohs scale are harder, and would erode more slowly than other rocks.
Lots of different rocks are worth money. One of the most expensive rocks are diamonds.But if you are talking about a plain rock,it would be really cheap
Sediment is brought to a location from different areas by water and wind. Of course there would be different ones at a different beach.