Humus is low in deserts primarily due to the arid climate, which limits organic matter decomposition and accumulation. The lack of moisture slows down the breakdown of plant and animal material, resulting in minimal organic content in the soil. Additionally, sparse vegetation in deserts means there is less plant material available to contribute to humus formation. Consequently, desert soils tend to be nutrient-poor and less fertile.
No the have little humus
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No, deserts or parts of deserts can be several thousand feet in elevation.
No. Height varies widely. There is even a formal division between high deserts (above 2,000 ft) and low deserts.
Clouds do not precipitate in deserts primarily due to low humidity. Deserts have very dry air with low moisture content, which limits the formation of rain clouds. The low humidity prevents sufficient condensation of water vapor in the atmosphere to form clouds that can produce precipitation.
Your question is redundant. All deserts are classified as deserts because of the low precipitation.
There are both cold deserts as well as hot deserts.
Some deserts have low elevation, some have a rather high elevation. Not all deserts have a low altitude.
Nighttime
low moisture.
Deserts have little rainfall. However, if the desert is irrigated, it can be, and is, quite porductive.
The only thing all deserts have in common is low rainfall.