Why aren’t desert landscapes jagged and rocky?

Deserts landscapes are jagged and rocky due to high erosion rates and chemical weathering. The chemical weathering changes the physical character of the rocks which is the cause of it being jagged and rocky.

rocks and weathering-matching

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.