APES – Daily Questions 9/21-9/25

1. What is humus?
2. Why is it important?
3. What does the color of topsoil tell you about its usefulness as a soil for growing crops?

1. What is desertification?
2. How serious is the problem?
3. What are the major causes and consequences?
4. How can we slow desertification?

1. Distinguish between salinization and waterlogging of soil.
2. How serious are those problem?
3. List 5 ways to reduce the threat of soil salinization.