1. How much of the Earth’s surface do the oceans cover? Which is the largest ocean? 2. What is a sea? What sea has the most confusing spelling?
3. What is a river? Where does it begin?
4. What is the source and the mouth?
5. What is the longest river? How many countries does it pass?
6. What is a lake? How are lakes formed?
7. Why do the lakes tend to dry up?
8. Name the pecularities of the Deas Sea.
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