1. What do plant roots prevent? (human impact) 2. What is planting trees around a field to prevent wind erosion? (soil conservation) 3. What are various methods humans use to take care of the soil ?(soil conservation) ?.4. What is it called when a steep field is changed to a series of smaller fields? (soil conservation) 5. What event occurred when farmers removed all of the grasses in the Great Plains, a drought occurred, topsoil blew away and dust was left? (human impact)

Key Questions  1. What is pollution?  2. What is air pollution?  3. What are emissions?  4. What is the ozone?  5. How does the ozone get holes in it?  6. Where do chloroflurocarbons come from?  7. What does UV radiation cause?  8. What is air conservation? 

1. What is pollution?  1. Pollution-a change in the environment (air, water, or soil) that is harmful to living things.

` Air pollution is caused by:  Power plants burning fossils fuels  Cars and trucks  Erupting volcanoes  factories 2. What is air pollution?

3. What are emissions? 2. Emissions-tiny particles and gases released into the air that cause pollution.

4. What is the ozone?  4. Ozone-gases that protect life on Earth from solar radiation.

5.. How does the ozone get holes in it?  5. The holes in the ozone come from chlorofluorocarbons also called CFCs.

6. Where do chlorofluorocarbons come from?  6. CFCs come from aerosol cans, cooling AC systems, refrigerator systems.

7. What Does UV radiation cause? 7. Ultraviolet radiation causes skin cancer and damaging effects of plants and animals.

8. What is air conservation?  8. Air Conservation  Filters on smokestacks at factories (filters out harmful chemicals)  Devices on car exhaust Part of a smokestack filter.