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.
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.
That would be mechanical weathering
abrasion.conglomerate
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.
Pebbles often get bigger further away from their source due to the process of erosion and transportation. As water, wind, or ice move the pebbles, they tend to collide with other materials, which can break off smaller pieces or smooth their edges. Over time, larger rocks may also be more resistant to erosion, allowing them to remain intact as smaller particles are worn away. This results in a gradual increase in the size of pebbles as they are transported to new locations.
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.
Weathering