1. The sea is blue because it reflects the colour of the sky., True, False, 2. Winding rivers with strong currents exist deep under the ocean., True, False, 3. The blue whale is the largest animal known to have ever existed., True, False, 4. Most volcanic eruptions are underwater., True, False, 5. The Pacific Ocean was named after the person who discovered it., True, False, 6. Humpback whales live all year round in the calm seas around Hawaii., True, False, 7. It’s impossible to surf huge waves of over twenty metres high., True, False, 8. The longest mountain range in the world is found underwater., True, False, 9. The Great Barrier Reef is composed of 900 tropical islands and can be seen from the moon., True, False, 10. The difference in the depth of water between low tide and high tide can be up to sixteen metres., True, False.

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