Vegetation root action is a form of biological weathering
Occurs due a combination of disintegration and decomposition (a mixture of physical & chemical weathering)
Presence of vegetation makes rocks vulnerable to vegetation root action
Example of vegetation root action: Ta Prohn Temple, Cambodia
Well jointed rocks are particularly vulnerable to vegetation root action as vegetation can grow in cracks in rock
Plant roots in search of minerals & water can grow/develop in cracks in rocks which exert pressure on the cracks (disintegration/physical weathering)
The composition of dead plants in soil may form organic acids which decompose minerals & rocks causing chemical weathering
Increased carbonation may also occur due to release of carbon dioxide from roots and decaying vegetation
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