Here's why:
* Minimal Rainfall: The Atacama receives an average of less than 0.004 inches (0.1 millimeters) of rainfall per year. Some parts haven't seen rain in decades.
* High Altitude: Its high altitude contributes to the dry conditions, as the air is thinner and holds less moisture.
* Rain Shadow Effect: The Andes Mountains block moisture-laden winds from the east, leaving the Atacama in the rain shadow.
* Cold Ocean Currents: The Humboldt Current, a cold ocean current, cools the air and reduces its ability to hold moisture.
While the Atacama Desert is the generally accepted driest place on Earth, there are other incredibly dry locations, including:
* McMurdo Dry Valleys, Antarctica: A cold desert with extremely low precipitation and high winds, creating very dry conditions.
* The Sahara Desert: While not as consistently dry as the Atacama, it is the largest hot desert on Earth and receives very little rainfall.
It's worth noting that the "driest place" can be debated depending on how you define "dry." Some argue that certain areas in Antarctica, like the McMurdo Dry Valleys, might be even drier than the Atacama based on relative humidity.
