The Earth Crossword

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Across
  1. 2. The process by which rocks and soil slowly break apart and are swept away
  2. 5. A violent shaking of Earth's crust
  3. 7. Layer of Earth that consists of molten rock, known as magma
  4. 10. A level area on Earth's surface
  5. 12. Slow movement of continents over time
  6. 14. A plain high above sea level with cliff on all sides
  7. 15. Large, powerful ocean waves that can cause great destruction of coasts
  8. 16. Formed by the sun, Earth, and seven other planets
  9. 18. A circle of volcanoes along the outer edge of the Pacific Ocean
  10. 20. Landform that is elevated, but less steep and rugged than a mountain
  11. 21. Layer of Earth that contains landmasses and the ocean floor
Down
  1. 1. Layer of Earth that consists of two sub-layers, the outer and the inner. Made up mostly of iron and nickel
  2. 3. The edge of a continent that extends under water into the sea
  3. 4. As section of Earth's crust that floats on the mantle
  4. 6. The process of water falling to Earth
  5. 8. The beginning of Spring and Autumn
  6. 9. The exact moment when Summer and Winter start
  7. 11. A low lying area surrounded by mountains
  8. 13. High and steep landform
  9. 17. Third planet from the sun
  10. 19. A mountain that erupts in an explosion of molten rock, gases and ash