Across
- 2. type of plates that move towards each other
- 3. are formed along spreading centers, typically beneath several kilometers of seawater.
- 5. A Chaotic time because of several meteorite bombardment
- 10. age where life forms are still limited to single-celled organisms without nucle
- 13. type of plates that move away from each other
- 14. Similar to midoceanic ridges, the transfer of heat and decompression result to magma generation.
- 15. type of stress formed when plates move away from each other
- 16. innermost layer of the Earth
- 18. type of plates that slip past each other
- 19. A mid-ocean ridge is a seafloor mountain system formed by plate tectonics
- 20. age of mammals
- 21. Physical weathering is caused by the effects of changing temperature on rocks,causing the rock to break apart.
- 22. are marker fossils used to define periods of geologic time.
- 24. age of reptile
- 25. outermost layer of the Earth
Down
- 1. Chemical weathering is caused by rain water reacting with the mineral grains in rocks to form new minerals (clays) and soluble salts.
- 4. eon where Earth started forming an ozone layer
- 6. largest layer of the Earth
- 7. the breakdown of rocks at the Earth’s surface.
- 8. eon of hidden life
- 9. thinnest but densest type of crust
- 11. type of stress when plates move toward each other
- 12. refers to Dynamic actions or events that occur at the Earth's surface due to application of natural forces
- 17. age of ancient life
- 23. type of stress when plates slip past each other