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1. What is the process of making something dirty? 

The world’s oceans are so vast that they can cope with the present levels of pollution

2. Find a word or phrase from the passage with the same meaning as the air, water and land in which we live?

 natural, pollution

3. What is the air surroundimg the earth called? 

It's call Earth's atmosphere

4. What could be best placed wealth, goods or products people can use? 

It could be best placed by resources.

5. What is a difficulty which needs attention and thought? 

Environmental pollution

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