Earthly Puzzle

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Across
  1. 2. Large ocean wave.
  2. 5. Deep gorge.
  3. 6. Preserved remains of an organism.
  4. 11. Landform at the mouth of a river.
  5. 12. Tropical forest.
  6. 15. Wearing away of land.
  7. 17. Breaking down of rocks.
  8. 18. Large mass of ice.
  9. 20. Naturally occurring solid.
  10. 22. Current: Flow of ocean water.
  11. 23. Cycle: Process of rocks changing form.
  12. 24. All living things on Earth.
Down
  1. 1. Boreal forest.
  2. 3. Grassland.
  3. 4. Earth's water.
  4. 7. Accumulation of sediment.
  5. 8. Arid region.
  6. 9. Layer of gases surrounding Earth.
  7. 10. Treeless region.
  8. 13. Mountain with molten rock.
  9. 14. Reef: Underwater ecosystem.
  10. 16. Tectonics: Theory of Earth's moving plates.
  11. 19. Rise and fall of sea level.
  12. 21. Sudden shaking of the ground.