Across
- 4. a piece of land surrounded by water
- 6. pure substance which cannot be broken down by chemical means
- 7. branch of science concerned with metals
- 11. a linear feature that exists between two tectonic plates that are moving away from each other
- 13. sideways and downward movement of the edge of a plate of the earth's crust
- 15. a solid inorganic substance of natural occurrence
- 16. a large natural elevation of the earth's surface rising abruptly from the surrounding level
- 19. a mountain or hill having a crater or vent where lava will be erupted
- 22. a line or series of mountains or hills
- 23. solid outer part of the Earth
- 24. a long high sea wave caused by an earthquake a sudden and violent shaking of the ground
- 25. to change in composition or structure
- 26. geological structural features as a whole
- 28. a limit of a subject or sphere of activity
- 29. the pointed top of a mountain.
Down
- 1. any naturally occurring solid mass or aggregate of minerals or mineraloid matter
- 2. a planar or gently curved fracture
- 3. the central part of something
- 5. an act or instance of colliding
- 8. nearly incompressible fluid
- 9. the fragmental material composing part of the surface of the globe
- 10. undersea mountains formed by volcanic activity
- 12. hot semifluid within the earth's crust
- 14. area on Earth where two or more lithospheric plates collide
- 17. type of excavation or depression in the ground
- 18. astronomical body orbiting a star
- 20. thick part of the earth's crust
- 21. instrument that measures details of earthquakes
- 27. made up or consisting of two or more existing parts or elements