1. What percentage of Earth is arable?

2. How wide, in miles, is a degree of latitude?

3. Which of these cities is sinking into the sea?

4. What is the circumference of Earth at the equator (in kilometers)?

5. How long does it take a bottle to bob across the Atlantic Ocean?

6. What is the word for land that has fallen down a slope?

7. Which of these is not a peninsula?

8. What word describes the bend of a river?

9. The world’s longest river is:

10. What is the name given to the imaginary line at latitude zero?