Flood waters cause rivers to scour out their beds, leaving a enter channel.
Erosion :)
An example of weathering abrasion is when rocks and pebbles carried by a river rub against the riverbed, causing both the rocks and the riverbed to wear down over time due to the abrasive action of the particles. This process results in the smoothing and rounding of the rocks and the deepening of the riverbed.
When rocks settle down at the bottom of a river, the process is called sedimentation. This occurs when the water's flow slows, allowing particles and sediments, including rocks, to accumulate on the riverbed. Over time, these sediments can build up and form layers, contributing to the river's geological features.
The abraision of rocks can happen when one rock hits another, when river rocks tumble in the riverbed by fast moving water, by blowing sand particles hitting the rock, and when rocks grind against each other.
River rocks become smooth and rounded primarily due to the processes of erosion and abrasion. As rocks are transported by the flowing water, they collide with each other and with the riverbed, leading to the gradual wearing away of their sharp edges and surfaces. The continuous flow of water enhances this process, allowing the rocks to become more polished over time. Additionally, sediment carried along by the water contributes to the smoothing effect.
Evolution
erosion. and due to that erosion we get sedimentary rock.
The three ways of river erosion are hydraulic action (force of water on the river banks), abrasion (wearing down of the riverbed by sediment), and attrition (erosion caused by rocks and sediment carried by the river rubbing against each other).
Riverbeds are typically made of a combination of soil, sediment, rocks, and other natural materials that have been eroded and transported by the flowing water. The composition of a riverbed can vary depending on factors such as the type of rock in the area, the speed of the water, and the amount of sediment carried by the river.
A rock is a mixture of compounds.
Abrasion. (~the process of scraping or wearing away)
This process describes mechanical weathering, specifically abrasion. As rocks are transported by the river's flow, they collide with each other and with the riverbed, causing them to break apart into smaller fragments. Over time, this leads to the gradual erosion of larger rocks and the formation of sediment.