Across
- 3. Falls on the border of Argentina and Brazil
- 6. Continent covered by ice
- 8. Kea, a massive shield volcano in Hawaii
- 9. Rocks in Sedona, Arizona
- 10. A steep-sided valley formed by erosion
- 11. Caves in New Zealand with bioluminescent insects
- 13. Flats in Bolivia’s Salar de Uyuni
- 14. Atacama Desert, one of the driest places on Earth
- 16. Cliffs along the Caribbean Sea in Mexico
- 18. Outback, a vast arid region in Australia
Down
- 1. National Park known for geysers and hot springs
- 2. Falls on the border of the US and Canada
- 4. Canyon carved by the Colorado River
- 5. Falls in Africa on the Zambezi River
- 7. Aurora Borealis, Northern Lights phenomenon
- 8. Everest, the highest peak on Earth
- 11. Barrier Reef in Australia
- 12. Caves in Kentucky, extensive underground formations
- 15. Capitan, a notable granite monolith in Yosemite
- 17. Sea, salt lake bordered by Jordan and Israel