Moisture speeds up chemical weathering. Weathering occurs fastest in hot, wet climates. It occurs very slowly in hot and dry climates. Without temperature changes, ice wedging cannot occur. If the area is hot and humid, chemical weathering is more prevalent. If it is drier, physical weathering is more predominant. Rocks in humid regions are exposed to abundant rainfall and hot temperatures weather much faster than similar rocks residing in cold, dry regions. Hence, the chemical weathering process is more dominant than the mechanical process in humid regions.