Crossword - Puzzle

1234567891011121314151617181920
Across
  1. 4. _______ is kind of igneous rock
  2. 6. _______ is kind of sedimentary rock
  3. 8. _______ is fluxing agents to form a glassy phase at low temperatures.
  4. 11. _______ contain at least three minerals.
  5. 12. _______ is one of the materials for the buildings.
  6. 15. _______can be found near the sea.
  7. 16. _______ is the solid rock that underlying loose deposits
  8. 17. _______ is heavy soil
  9. 18. _______ is a natural compounds.
  10. 19. _______ is the outermost layer of a planet.
  11. 20. _______ is an area of ground that was no natural external surface
Down
  1. 1. _______ is very hard,crystalline mineral composed of silicon.
  2. 2. _______ is hot liquid and semi-liquid
  3. 3. _______ is a deep natural underground cave formed by the erosion of rock
  4. 5. _______ is formed when molten rock cools to a solid state.
  5. 7. _______ is the rock that formed at near Earth's surface
  6. 9. _______ is a solid mass of geological materials
  7. 10. _______ is a metamorphic rock of sedimentary origin
  8. 13. _______ is the thin layer of material covering the earth's surface
  9. 14. _______ is formed that from other rocks that are changed
  10. 16. _______ is the rapid cooling of basaltic lava