Why Deserts Are Extreme Environments

Seven Harsh Factors

1. Extreme Heat: Daytime temperatures often exceed 40 °C (104 °F).
2. Minimal Rainfall: Some areas receive <25 mm annually; years may pass without rain.
3. Low Humidity: Often below 10%, accelerating dehydration.
4. High Evaporation: Surface water vanishes rapidly.
5. Poor Soils: Sandy, rocky, low organic matter—unsuitable for most crops.
6. Strong Winds: Sandstorms erode surfaces and reduce visibility.
7. Intense UV Radiation: Clear skies expose life to damaging ultraviolet rays.

Survival requires specialized adaptations: water storage, nocturnal activity, reflective coatings, deep roots, and efficient kidneys.