Deserts occur where evaporation greatly exceeds the rainfall.
More than one-third of Earth is already classified as arid or semiarid desert. There is a general trend toward desertification. Measures can be taken to combat desertification and promote rehabilitation of land that has already become desert. Materials Procedures Adaptations Discussion Questions Extensions Evaluation Suggested Readings Links Vocabulary Academic Standards Credit Printable version of the lesson plan in rich text format. Use our Teaching Tools to create custom worksheets, puzzles and quizzes about this topic.