1. What is soil made of?

2. What important soil measurement determines how much water it can hold?

3. What is another name for the layers of soil?

4. What is the solid mass of rock below soil called?

5. What layer is considered the 'B' layer of soil?

6. What layer is the primary layer of soil where plants and animals live?

7. What layer is also called the humus layer and is made up of plant remains like leaves and twigs?

8. What layer is called the 'C' horizon and is made up mostly of rocks?

9. How does soil help in supporting life on Earth?

10. True or False: Soil can be over-farmed to where crops can no longer grow in it.