Different landforms and processes involved in their formation

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Across
  1. 6. protects us from harmful radiation from the sun
  2. 7. predominantly silt-sized sediment formed by the accumulation of windblown dust
  3. 10. circulating effect
  4. 12. the last and inner most layer of the earth
  5. 15. defined as the natural physical features of the earth
  6. 17. sometimes called "gorge", deep ravine between cliffs
  7. 19. has a flat topped hill and steep sides
  8. 20. also called as a rock pedestral
  9. 21. small mounds of hills and sand
Down
  1. 1. largest layer of the earth
  2. 2. is a low lying area of land situated between hills or mountains
  3. 3. earth's crust as well as underlying cool, dense and rigid upper part of the upper mantle
  4. 4. created from exclusively erotional and weathering activites
  5. 5. are flat and broad land areas and great changes in elevation
  6. 8. also known as table lands or flat topped mountains
  7. 9. are formed by the chmical and mechanical action of the wind
  8. 11. are those that rise higher than the rest of their surroundings
  9. 13. elevated portions of lands that are formed by faulting
  10. 14. are landforms controlled by gelogoical processes
  11. 16. believed to be the responsible for different rock behaviors within the mantle
  12. 18. was discovered by a croatian seismologist Andrea Mohorocivic