Across
- 2. The thick, dense layer of rock, approximately 1,429 mi. (2,300 km) thick, between Earth's crust and its core.
- 4. A tectonic process that results when plates converge and one plate forces the other down into Earth's mantle
- 5. one of the three ways that tectonic plates interact - occurs when two plates grind past each other with only limited convergent or divergent activity
- 7. form of stress which tries to reduce the size of a material
- 10. The upper layer of Earth's interior, including the crust and the brittle portion at the top of the mantle
- 12. a depression in earth's crust
- 15. A general statement derived from a hypothesis that has withstood sufficient testing
- 16. one of the three ways that tectonic plates interact - areas where plates move toward each other and collide
- 17. the hypothesis that the Earth's continents have moved over geologic time relative to each other - theory made by Alfred Wegener
- 18. A term describing a phenomenon whereby certain materials are subject to a form of decay brought about by the emission of high-energy particles or radiation
- 20. the thin outer shell of the earth
Down
- 1. An area of historical geology devoted to studying the direction and intensity of magnetic fields in the past, as discerned from the residual magnetization of rocks
- 3. fracturing between rocks resulting from stress
- 6. The theory that seafloors crack open along the crests of mid-ocean ridges and that new seafloor forms in those areas
- 8. A split between two bodies (like two plates) that once were joined
- 9. the hot and dense centre of the earth
- 11. A branch of the earth sciences that combines aspects of geology and physics
- 13. boundaries between plates
- 14. A deep depression in the ocean floor caused by the convergence of plates and the resulting subduction of one plate
- 19. one of the three ways that tectonic plates interact - areas where plates move away from each other, forming either mid-oceanic ridges or rift valleys