1. Questions, p
“The Changing Pond”

2. 1. As they age, natural ponds go through a gradual process of change known as ___.
2. ___ are often attached to leaves, straw, and soil that get carried into ponds.
3. Many of these form an envelope, called a ___, to protect themselves against unfavorable conditions.

3. 4. Over many years, plants and animals in the pond die, and their remains fall to the bottom of the pond. The mixture that forms is known as ___.
5. It provides nourishment for organisms known as ___.
6. What are some examples of these types of organisms?

4. 7. Eventually what happens as a result of the decomposition?
8. Once the pond has filled in, it becomes what type of area?
9. As the area continues to fill in, trees begin to grow, and the pond dries out. What type of ecosystem then develops?

5. 10. Once this happens, and the pond has completed its succession, it is known as a __ __.