Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.

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 Check 

Across: 1. Line on a mountain above which trees do not grow. 5. Movement of gravel, sand and mud 6. Lake created by a dam 7. Accumulated sediment deposited at the mouth of a river 9. Narrow piece of land that projects iinto the sea 12. Theory that earth's crust is divided into plates that are slowly moving 13. The "younger" ones are generally higher and more rugged 14. Thick mass of ice 16. Large sea waves caused by earthquakes on the ocean floor 18. Liquid rock within the earth 20. Flat or nearly flat land 22. Largest layer of the earth 23. Elevated land that rises above nearby land ; tableland 24. Deep narrow valley having high steep slopes; caused by water erosion

Down: 2. Liquid rock that spills out of a volcano 3. Land in the Netherlands created from the sea 4. A group of many islands 8. Breaking up and decay of rocks over time 10. Land surrounded by water on 3 sides 11. Landform created when earth's plates collide or push against each other 15. Uppermost or top layer of the earth 17. Narrow piece of LAND joining 2 larger pieces of LAND 19. Area where tectonic plates meet: where earthquakes are likely to occur 20. One large continent on earth that existed millions of years ago. 21. Land that boarders a sea or ocean