1. How much of the eath's surface is covered by oceans?

2. Name the seas the grenwich meridian line runs through.

3. Which is the most fished ocean in the world?

4. What is krill, and why is it important to humpback whales?

5. How many tonnes of phytoplankton (plant plankton) grow in the Southern Ocean every year?

6. Which types of sea creatures are most at risk from pollutants?

7. How many tonnes of fishes are caught by marine fisheries every year? And what other creatures get caught in their nets?

8. What is the deepest place in the ocean?

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