Nature

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Across
  1. 7. A cascade of water falling from a height, often over rocks or cliffs
  2. 8. A landform that rises high above its surroundings
  3. 11. A large and sudden rise and fall in the sea level caused by gravitational forces of the moon and sun
  4. 13. An overflow of water that submerges land
  5. 14. A natural watercourse that flows towards an ocean, sea, lake, or another river
  6. 16. A rotating column of air that forms from severe thunderstorms
  7. 17. A tropical cyclone with strong winds and heavy rain
  8. 18. A multicolored arc in the sky caused by the refraction of light in water droplets
Down
  1. 1. A sudden and powerful discharge of electricity in the atmosphere
  2. 2. A barren area with little precipitation and sparse vegetation
  3. 3. A diverse underwater ecosystem made up of colonies of coral polyps
  4. 4. A sudden and violent shaking of the ground caused by the movement of tectonic plates
  5. 5. A large mass of ice that moves slowly over land
  6. 6. The daily disappearance of the sun below the horizon
  7. 9. A sandy or rocky shore by the ocean, sea, or lake
  8. 10. A deep and narrow valley with steep sides
  9. 12. A mountain with a vent through which lava, rock fragments, ash, and gas erupt
  10. 13. A large area dominated by trees and undergrowth
  11. 15. A natural light display in the sky, also known as the Northern Lights or Southern Lights
  12. 19. A vast body of saltwater that covers much of the Earth's surface