In tropical Africa the basal weathering front (the lowest limit of weathering underground) is frequently 60 m down.
The more extreme the climate, the quicker weathering occurs, whether the climate is very cold or very hot.
Chemical weathering is when gases dissolve in rain to make weak acids that corrode rocks including limestone.
Weathering functions mechanically (through temperature changes), chemically (through chemicals in rainwater) and organically (through plants and animals).
The main form of mechanical weathering is frost shattering when water expands as it freezes in cracks in the rocks and so shatters the rock.
Weathering is the breaking up of rocks by agents such as water, ice, chemicals and changing temperature.
A big chunk of bedrock many 100s of feet long is separated into smaller and smaller pieces, until finally you can find many tens of 1000s of small rocks. Frequently rocks are separated so much that they become dirt.
Weathering happens as rocks are separated into progressively smaller parts by the effects of weather. These parts do not move to a new area, they simply break down, but stay next to one another.
Weathering is most frequent at the surface in which exposed bedrock meets the atmosphere. However, weathering can extend many 1000s of feet downward into the Earthís crust, following cracks, fissures, and microscopic holes that permit water to penetrate.
Weathering is due to water, as it freezes and thaws, as well as through chemical reactions that loosen the bonds holding rocks with each other.
You can find many causes of chemical weathering,
Water: This is the most crucial cause of chemical weathering. The water weathers the rock by dissolving it into the water.
Oxygen: This is also a significant cause of chemical weathering. Do you remember when you were a small kid and you left your bike outside while it was raining and it rusted? Well, iron combines with oxygen in the existence of water. This process is referred to as oxidation. The result is rust. Rock which contains iron also oxidizes.Carbon Dioxide: This dissolves in rainwater, the outcome a weak acid known as carbonic acid, this outcome effortlessly weathers limestone and marble.