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Biological weathering is the breakdown of rocks by living things like plants, animals, and microbes.
What are two examples of biological weathering of rocks?
Tree roots breaking rocks and lichens producing acids on rock surfaces are common examples.
How do animals cause biological weathering?
Animals burrow and dig soil, exposing rocks and causing them to break down.
Which organisms cause chemical biological weathering?
Lichens, fungi, and bacteria cause biological weathering to release acids that chemically react with rock minerals.
What is the significance of biological weathering in geography?
Biological weathering plays a key role in soil formation and landscape evolution, shaping Earth's surface over time.
Biological Weathering, Meaning, Types, Examples & More
Biological weathering is the breakdown of rocks by living organisms. Keep reading to learn the definition, process, types, examples, and importance of biological weathering.
Deeksha Dixit16 Jun, 2025
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Biological weathering is the process by which living organisms, such as plants, animals, and microbes, contribute to the breakdown and disintegration of rocks and minerals. It plays a critical role in soil formation and landscape evolution by exposing fresh rock surfaces to further weathering and erosion.
Biological Weathering Definition
Biological weathering is the breaking down of rocks, minerals, and soil through the actions of living organisms. These include plants, animals, bacteria, fungi, and even humans. This type of weathering occurs when living beings grow, move, or produce chemicals that weaken or break apart rocks.
For example, when plant roots grow into cracks in rocks, they exert pressure. This pressure causes the rock to split or break. Microorganisms can also release acids that dissolve minerals. This is a slow but steady process that changes the shape and structure of land over time.
Biological weathering is different from physical and chemical weathering because it involves life forms. Yet, it can work along with them to accelerate the weathering process.
Biological Weathering Process
The process of biological weathering involves physical forces and chemical changes caused by living things. Here's how it happens step by step:
Growth of Roots: Plant roots grow into tiny cracks in rocks. As they grow, the cracks widen, and the rock slowly breaks apart.
Burrowing Animals: Animals like moles, rabbits, and earthworms dig into the soil. Their movements loosen rocks and soil, exposing them to air and water.
Chemical Secretion: Lichens, fungi, and bacteria produce acids. These acids break down the minerals in rocks.
Decay of Organic Matter: When plants and animals die and decompose, they release carbon dioxide. This mixes with water to form weak carbonic acid, which reacts with rocks.
This process does not happen overnight and can take years or even centuries. However, it plays a major role in soil formation and landscape changes.
Biological Weathering Agents
Biological weathering agents are living organisms that contribute to rock breakdown through physical and chemical processes. These are:
Burrowing exposes rocks to air/water (physical); acidic secretions (chemical).
Microorganisms
Lichens, bacteria, fungi
Release chelating acids (e.g., oxalic acid) to dissolve minerals.
Humans
Mining, agriculture, and construction
Excavation disrupts rock layers; soil tillage increases weathering rates.
Types of Biological Weathering
Biological weathering can be divided into two main types based on the way organisms affect rocks:
1. Physical (Mechanical) Biological Weathering
This occurs when living beings apply physical force to rocks.
Example: Tree roots growing and expanding inside cracks.
2. Chemical Biological Weathering
This happens when organisms produce chemicals that react with rock minerals.
Example: Lichens secreting acid that slowly dissolve rock.
While classified separately, physical and chemical biological weathering often co-occur. For instance, a root may both split a rock and release acids to dissolve it. These actions help convert rocks into soil and support plant life.
Biological Weathering Examples
Biological weathering can be easily seen around us. Here are a few common and clear examples:
Tree roots breaking sidewalks: Roots grow into concrete or rock, causing cracks and lifting.
Lichen on rocks in forests: Lichens secrete acids that slowly dissolve the rock.
Burrows created by rabbits: Burrowing loosen soil and expose deeper rocks to weathering.
Algae on old buildings: Moisture and microbes produce acids that erode stone structures.
These examples show how life constantly interacts with rocks, even if we don’t always notice it.
Importance of Biological Weathering
Biological weathering plays a key role in nature. It may seem slow, but it supports many natural processes. Here’s why it matters:
Soil Formation: It helps break rocks into smaller particles that mix with organic material to form soil.
Nutrient Release: Weathering releases important minerals from rocks into the soil, which plants absorb.
Supports Ecosystems: It prepares land for vegetation by softening hard surfaces.
Landscape Shaping: Over long periods, it changes the shape of the land.
Carbon Cycle Balance: Microbes help control carbon dioxide by forming weak acids that react with rocks.
In short, biological weathering keeps ecosystems healthy and supports life on Earth.
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