Ecosystems change in several ways, both naturally through events like volcanoes, fires, and floods, and through the actions of animals and humans. Animals such as locusts, beavers, and earthworms can alter ecosystems through behaviors like swarming, dam building, and soil digging. Humans make significant changes by building infrastructure, clearing land, transporting new species, producing pollution, and discarding garbage.

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