Explanation:

- Mechanical Weathering: This is the breakdown of rocks through physical processes. In hot-tropical desert areas, intense temperature fluctuations cause rocks to expand and contract, leading to cracking and disintegration.

- Chemical Weathering: Involves the alteration of rock chemical composition. It's less common in deserts due to low moisture levels.

- Biological Weathering: Caused by plants, animals, or microorganisms. It's minimal in deserts due to sparse vegetation.

- Leaching: The removal of dissolved materials from the soil. It’s not significant in deserts due to limited water.

Mechanical Weathering is correct for desert areas.