Arid lands are regions characterized by low rainfall, typically receiving less than 250 millimeters (10 inches) of precipitation annually. These areas often have extreme temperatures, with hot days and cooler nights. The lack of moisture limits vegetation, resulting in sparse plant life, primarily consisting of drought-resistant species like cacti and shrubs. Common examples of arid lands include deserts such as the Sahara in Africa and the Mojave in North America. These ecosystems support unique wildlife adapted to harsh conditions, including reptiles, rodents, and various insects. Despite their challenges, arid lands play a crucial role in Earth's biodiversity and climate regulation.