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Biological weathering is a type of weathering caused by plants, animals, and micro organisms. The root “bio” means “life”.

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Types of biological weathering by chemical and physical means:

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Types of biological weathering by chemical and physical means:

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* Plants
* Animals
* Micro organisms

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When animals like birds forage for seeds and earthworms, they create holes and erode the upper surface of the soil and this contributes to weathering.

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Humans can also indirectly contribute to biological weathering. Walking or running makes the soil particles crushed into smaller pieces. Other human activities such as planting and road construction can also contribute to biological weathering.

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Indirect biological weathering by humans:

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Indirect biological weathering by humans:

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Roots of trees or plants in general can biologically weather rocks by growing into the cracks and fractures of rocks and soil. They become more easy to break and they eventually fall part.

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The minerals in rocks are liberated when a fungus releases chemicals that can break them down. Such minerals are then consumed by the alga, further causing the wearing and development of cracks and gaps on the rock. As a result, cracked rocks become more prone to disintegration.

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https://www.geolsoc.org.uk/ks3/gsl/education/resources/rockcycle/page3568.html

https://kidsgeo.com/geology-for-kids/biological-weathering/