All deserts receive less than 10 inches (250 mm) of rainfall on average per year. Some receive virtually no rainfall for decades or even centuries.
A waterhole is a pit in the ground usually in deserts, that is filled up with rainwater.
Clouds do not precipitate in deserts due to low pressure. Clouds do not precipitate in deserts due to low pressure.
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.
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.
The only thing all deserts have in common is low rainfall.
Deserts have little rainfall. However, if the desert is irrigated, it can be, and is, quite porductive.
Deserts have very low humidity and very high temperatures, very low temperatures, or can alternate between the two. Heat and low humidity can cause fatal dehydration in a matter of hours. Low temperatures can cause hypothermia. Some deserts are prone to dust storms.