1. HUMAN ENVIRONMENT INTERACTION

2. People & the Environment  People depend on the environment for survival  Throughout history humans have altered the environment  Clearing of forests  Irrigation Ditches  Terrace Farming  Dams

3. Clearing Land  Forests are cut down in order to make room for agriculture  Negatives?  Positives?

4. Irrigation Ditches  People reroute rivers to provide irrigation for agriculture.  Negatives?  Positives?

5. Terrace Farming  Farming used to level out steep slopes and allow crops to grow.  Negatives?  Positives?

6. Dams  A dam is a barrier that impounds water or underground streams.  The reservoirs created by dams not only suppress floods but provide water for various needs to include irrigation, human consumption, industrial use, aquaculture and navigability.

7. Questions  What other ways have humans changed the physical geography of the earth?  What are some unforeseen consequences of altering the earth that we may have experienced?