1. How do
ecosystem
s change?
Grade 3

2. Ways
ecosystems
change :

3. Volcanoes

4. Fires

5. Floods

6. ways animals
change
ecosystems:

7. 1.locusts1. locusts

9. 2. beavers build
dams

10. 3. earthworms dig holes
in soil- bring oxygen to
plant roots

11. ways
people
change
ecosystems:

12. 1. build houses

13. 2. clear forests

14. 3. introduce new plants &
animals
(accidentally or on purpose)

15. 4. throw out garbage

17. 4. Air pollution