For upon |This is the decomposition of rocks due to chemical reactions occurring between the minerals in rocks and the environment. The examples below illustrate chemical weathering.

Water

Water, and many chemical compounds found in water, is the main agent of chemical weathering. Feldspar, one of the most abundant rock-forming minerals, chemically reacts with water and water-soluble compounds to form clay.

Acids

© Stuart Jennings, Montana State

Water contains many weak acids such as carbonic acid. This weak, but abundant, acid is formed when carbon dioxide gas from the atmosphere mixes with rainwater. Sulfur dioxide and nitrogen gases create other types of acid rain that act as chemical weathering agents. Some sources of sulfur dioxide are power plants that burn coal; as well as volcanoes and coastal marshes. Sulfur gases react with oxygen and rainwater to form sulfuric acid. Although relatively weak, the acid’s abundance and long-term effects produce noticeable damage to vegetation, fabrics, paints, and rocks.

Oxidation

Oxidation is another kind of chemical weathering that occurs when oxygen combines with another substance and creates compounds called oxides. Rust, for example, is iron oxide. When rocks, particularly those with iron in them, are exposed to air and water, the iron undergoes oxidation, which can weaken the rocks and make them crumble.

When it comes to chemical weathering, it’s all about chemistry. By looking at the term “chemical weatherings,” you can see that a chemical reaction causes something to break down or “weather.” That “something” is rocks and minerals.

In chemical weather, rocks and minerals react to acids, oxygen, carbon, and water. That’s why no two rocks ever look exactly the same. It’s also the reason that we have those awesome-looking caves and unique rock formations all over the world.

While chemical weather creates nifty formations, the way it breaks down rocks also causes fractures in ancient structures like the Great Sphinx of Egypt. It also causes the surface to break down on gravestones.

The article was originally published here.

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