biological weathering
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Biological weathering is an important form of rock breakdown on rocky coasts. Many organisms, such as barnacles and limpets, secrete organic acids that help to dissolve the rock. This is especially important in rock pools, where there is only a small amount of water. This means that the water can become quite acidic and break down the rock. It most commonly affects limestone and chalk, although it is also important for its effects on granite.
| Form of weathering caused by the activities of living organisms – for example, the growth of roots or the burrowing of animals. Tree roots are probably the most significant agents of biological weathering as they are capable of prising apart rocks by growing into cracks and joints. Plants also give off organic acids that help to break down rocks chemically (see chemical weathering). |
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