riddles about natural knowledge

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Across
  1. 2. Iconic 300-meter-tall tower located in Paris, France (Eiffel)
  2. 4. Eastern European country known as the "Land of Windmills" (Netherlands)
  3. 6. Gas inhaled by humans and animals for breathing (Oxygen)
  4. 8. Official currency used in Japan (Yen)
  5. 10. Mythical bird that serves as Indonesia's national symbol (Garuda)
  6. 11. Green substance in plants that plays a role in photosynthesis (Chlorophyll)
  7. 13. World's smallest continent, which is also a single country (Australia)
  8. 15. Largest living land mammal (Elephant)
  9. 17. Largest planet in our solar system (Jupiter)
  10. 18. Red fluid in the human body pumped by the heart (Blood)
  11. 19. Largest continent on Earth by land area (Asia)
Down
  1. 1. Instrument used to record and measure earthquake strength (Seismograph)
  2. 3. Unit of temperature in the International System of Units (Kelvin)
  3. 5. North African country famous for its pyramids and the Sphinx (Egypt)
  4. 7. Shiny yellow precious metal often used for investment (Gold)
  5. 9. Highest mountain in the world, located in the Himalayas (Everest)
  6. 12. Capital city of Indonesia (Jakarta)
  7. 14. Imaginary line dividing the Earth into northern and southern hemispheres (Equator)
  8. 15. Human sensory organ used for seeing (Eye)
  9. 16. World's largest and deepest ocean (Pacific)