Across
- 3. Crust is [blank] at diverging oceanic plates
- 6. Layer of Earth's atmosphere that blocks harmful radiation
- 7. Dense mineral found in the Earth's core
- 10. Landform created at converging oceanic-continental plate boundaries
- 11. Rate at which radioisotopes decay, making it possible to use decay to predict rock ages
- 13. The idea that the same processes happening today were happening in the past
- 17. Plate boundaries that slide in opposite directions
- 18. Formed by continental plate divergence
- 22. The largest time period in the geologic time scale (further broken into eras and periods)
- 24. Formed by continental plate convergence
- 25. Important molecule to sustain life on Earth
- 27. A mass event when large numbers of organisms die in a short amount of time
- 29. Plate boundaries that spread apart
- 30. Atoms with unstable nuclei that breakdown, or decay
Down
- 1. Measurable values that can be used to compare design solutions
- 2. A layer of gases the envelop at planet
- 4. Processes that add to the surface of the Earth, such as mountain building
- 5. The first organisms on Earth to begin photosynthesis
- 8. The characteristics of an organism that help it survive in a given environment
- 9. A natural event that has the potential to impact societies and the environment
- 12. Processes that destroy landforms, such as weathering and erosion
- 14. The numeric age of a layer of rocks or fossils
- 15. The youngest layers of rocks are found at the top and oldest layers are found at the bottom of a cliff
- 16. Conditions that must be met by an engineering design. These can limit the possible solutions.
- 19. Supercontinent that existed millions of years ago
- 20. The age of a rock in comparison to other rocks
- 21. Movement in the mantle caused by heat and density that moves the Earth's crust
- 23. The remains of a prehistoric organism that supports the theory of Pangaea
- 26. Plate boundaries that move together
- 28. Crust is [blank] at converging continental plates