Across
- 1. the remains or impression of a prehistoric plant or animal embedded in rock and preserved in petrified form.
- 5. volcano is currently active
- 9. a mudflow formed of water and volcanic ash
- 11. current in a fluid that results from convection
- 13. intensely hot area in the mantle below Earth's crust
- 15. the third layer of the Earth
- 17. lava and other igneous rock is formed on cooling.
- 18. mountain that has a crater or vent through which lava comes out
- 19. rigid outer part of the earth, consisting of the crust and upper mantle
- 20. the envelope of gases surrounding the earth or another planet.
- 21. breakdown of rock by the action of bacteria, plants and animals.
- 23. he mostly-solid bulk of Earth's interior
- 24. two tectonic plates move away from each other
- 25. started out as some other type of rock, but have been substantially changed from their original igneous
- 26. the point on the earth's surface vertically above the focus of an earthquake.
Down
- 2. large slabs of Earth's lithosphere—split apart from each other
- 3. types of rock that are formed by the accumulation or deposition of mineral
- 4. upper layer of the earth's mantle, below the lithosphere
- 6. two plates slide past one another
- 7. plate ________ theory
- 8. volcanoes that wont erupt again
- 10. solid material found in the centre of some planets
- 12. volcanoes that have not erupted in a long time but are expected to erupt again
- 14. A theory explaining the structure of the earth's crust
- 16. sideways and downward movement of the edge of a plate of the earth's crust
- 22. ground shaking caused by the energy that is released when rock on either side of a fault suddenly moves.
- 27. formed from the solidification of molten rock material