Mechanical weathering due to changes in temperature occurs mainly in

Mechanical weathering due to changes in temperature occurs mainly in desert regions. This is because in desert regions, temperatures are very high during the day, and very low at night. This results in the expansion and contraction of rock surfaces, causing them to crack and break down. The daily temperature fluctuations cause repeated expansion and contraction, which leads to the breakdown of rocks into smaller pieces. This type of mechanical weathering is called thermal stress weathering or insolation weathering. In wet equatorial regions, chemical weathering due to the action of rainfall and high temperatures is more common. In coastal areas and polar regions, other forms of mechanical weathering, such as abrasion and freeze-thaw weathering, respectively, are more prevalent.