Sand deserts are vast, dry regions characterized by sandy terrain and minimal vegetation. They typically receive less than 10 inches of rainfall annually, making it difficult for most plants and animals to survive. The high temperatures during the day can exceed 100°F, while nights can be surprisingly cool. These deserts, such as the Sahara Desert in Africa and the Gobi Desert in Asia, are formed by various geological processes, including erosion and sediment deposition. Sand dunes, which can reach impressive heights, are a common feature, shaped by wind patterns. Despite their harsh conditions, some life forms, like cacti and lizards, have adapted to thrive in these environments.