Our World 4. UNIT 6 Review

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1. It is a form of pollution. It often happens at oceans, lakes or rivers. It makes the water dirty. What is it?

A. an oil spill

2. It is an area different from the areas around it. It has different characteristics or people use it for different purposes. What is it?

A. a zone

3. It is a very large sea creature. It breathes air through a hole at the tops of its head. What is it?

A. a whale

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