4a. make up questions about pollution (ex. 2) for a “pollution quiz'. work in groups. think of the answers. 1. nature / millions of years ago? 2. waterborne diseases / in ancient rome? 3. cholera, typhoid / in the middle ages? 4. air pollution / in the 20th century? 5. acid rain / form? 6. air pollution / the entire ecosystem of the ocean? 7. ozone layer / deplete? 8. pesticides and herbicides / dangerous? 9. fossil fuels / habitats and rainforest?

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