The two main factors that speed the rate of chemical reaction in rocks during weathering are Temperature and pressure.
High temperatures and high rainfall accelerate chemical weathering. Rocks in tropical regions exposed to heavy rainfall and high temperatures are blessed with much faster weather than similar rocks in cold and dry regions.
Chemical weathering usually increases as temperatures rise and it rains. That is, rocks with hot and humid climates are more rapidly affected by chemical weathering than rocks with cold and dry climates.
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