hamstring
Pebbles can help purify water by providing a medium for beneficial bacteria to grow on. These bacteria can break down organic matter and contaminants in the water, improving its quality. Additionally, the physical structure of pebbles can also help to trap and remove solid particles from the water.
When pieces of chalk are shaken in a jar with pebbles, they will break down into smaller pieces due to the abrasive action of the pebbles rubbing against them. This process is known as abrasion and will result in the chalk becoming smoother and rounder over time.
This process is known as weathering, where the rock is broken down by a combination of physical, chemical, and biological processes. These processes can include erosion, freeze-thaw cycles, root growth, and oxidation, which gradually break the rock into smaller pieces.
A real world example of weathering is when rocks break down into smaller pieces due to the repeated freezing and thawing of water in cracks. Over time, this process causes the rocks to disintegrate into smaller fragments like pebbles and sand.
As pebbles are transported downstream by the flowing water, they collide with each other and with other debris, causing them to break into smaller fragments. This process is known as attrition and leads to the gradual decrease in pebble size as they travel downstream. Additionally, smaller pebbles are also more easily carried by the current, allowing them to be transported further downstream.
That would be mechanical weathering
Ice wedging is actually a physical weathering process, not chemical. It occurs when water seeps into cracks in rocks, freezes, expands, and causes the rock to break apart over time.
Weathering
An example of physical weathering is freeze-thaw weathering, where water seeps into cracks in rocks, freezes, expands, and causes the rock to break apart. The rock is weathered in this process, as the repeated freezing and thawing weakens and eventually breaks it apart.
abrasion.conglomerate
Root wedging is a physical weathering process where plant roots grow into cracks in rocks, exerting pressure that causes the rock to break apart. As the roots grow and expand, they can increase the size of the cracks and eventually cause the rock to split. This process is effective in breaking down rocks and is commonly seen in areas with vegetation.
Waves break rock into tiny pieces through a process called abrasion. This results in the formation of sediment, such as sand or pebbles, which accumulate along the shore.