Question #b8d35

1 Answer
Feb 4, 2018

warm and wet


Chemical weathering is stronger on some rocks that are more soluble when attacked by acidic solutions.To happen it requires a wet (water) and warm (water in liquid form) climate.

A classical example is the dissolution of limestone (called karst erosion from the geographical name of a region in NE Italy called Carso where such erosion is very active) by acidic rain.

Rain gets its acidity from the naturally dissolved CO2 present in the atmosphere. Moreover water circulating in organic matter can become acidic.

If the climate is too dry there is not enough rain for the weathering to happen.

Also if the climate is very cold through the year (e.g. sub-polar regions) the water will mostly be in solid form (ice, snow) and once again the chemical reactions needed for the chemical weathering will not happen.

A wet and warm climate is therefore the most favorable for chemical weathering.

As example Florida (USA) is affected by strong karst erosion because of the presence of limestone deposits and abundance of chemically aggressive (acidic) water in a warm and humid climate.