- An example of weathering is a plant root growing into a crack in rock
- A tree is a kind of plant
- So, a tree's root growing into a crack in rock is an example of weathering

- A plant is a kind of organism
- A tree is a kind of plant
- Hence, a tree is a kind of organism

- A tree's root growing into a crack in rock is an example of weathering
- A tree is a kind of organism
- Hence, a tree's root growing into a crack in rock is an example of organism causing the weathering

- A tree's root growing into a crack in rock is an example of organism causing the weathering
- Organic weathering means organisms cause the weathering of rocks
- Hence, a tree's root growing into a crack in rock is an example of organic weathering

Hence, a tree's root growing into a crack in rock is an example of organic weathering
Which is an example of organic weathering of rocks?
- An example of weathering is a plant root growing into a crack in rock 
- A plant is a kind of organism 
- A tree is a kind of plant 
- Organic weathering means organisms cause the weathering of rocks