The world

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Across
  1. 4. The largest country in the world by area.
  2. 5. The desert famous for its vast dunes in Africa.
  3. 6. This phenomenon causes Earth's rotation to slow slightly over time.
  4. 8. The coldest continent and home to the largest cold desert.
  5. 9. The longest river by volume and flows through South America.
  6. 10. The coldest inhabited place on Earth.
  7. 12. The largest ocean on Earth.
  8. 13. This celestial body has one-sixth the gravity of Earth.
Down
  1. 1. The tallest mountain in the world.
  2. 2. Wall A structure in China often said to be visible from space.
  3. 3. The smallest country in the world.
  4. 7. The largest hot desert on Earth.
  5. 8. Produces 20% of the world's oxygen and is called the "lungs of the Earth."
  6. 11. The name of the deepest trench in the ocean.