Across
- 2. circulating current
- 4. flat and broad land areas
- 6. rise higher than the rest of their surroundings
- 9. largest layer of the earth
- 13. thinnest layer of the earth
- 16. can be found in the deepest region of the planet
- 18. protects us from the harmful rays
- 19. rock that resembles the shape of a mushroom
- 20. a low-lying area of land between hills and mountains
Down
- 1. high rocky coasts
- 3. a deep ravine between cliffs
- 5. composed mainly of an iron-nickel alloy
- 7. most common type of dune
- 8. can be regarded as a ball of very hot metals
- 10. Outer solid part of the planet
- 11. a highly viscous layer
- 12. also known as table lands or flat-topped mountains
- 14. Study of the flow of matter
- 15. scientific study of landforms
- 17. created from exclusively erosional and weathering activities