Across
- 4. tectonic plates move away from each other usually forms new crust and rift valleys
- 6. An opening in the earths crust through which molten rock is pushed out and creates new rock
- 9. formed as plate boundaries usually when plates collide
- 12. fractures or zones of weakness in the earths crust
- 14. Extinction events that occur over a longer time period
- 17. sudden events that led to a mass extinction
- 18. plates large rigid pieces of the earths lithosphere that move and interact with each other along plate boundaries
- 21. located between the mantle and the outer core
Down
- 1. new oceanic crust is formed as tectonic plates pull apart and magma rises
- 2. Formed as a result of high temperature and pressure deep within earth changing a rock that already existed
- 3. cycles hot material rises cooler materials sink it drives plate tectonics
- 5. the semi fluid layer of the mantle where convection currents happen
- 7. includes the crust and upper part of the mantle and it divided into tectonic plates
- 8. A group of the same species living in the same area
- 10. where tectonic plates slide past each other causes earthquakes
- 11. deep elongated depressions in the ocean often associated with subduction zones
- 13. Forms after weathering and erosion when sediments compact and cement
- 15. instruments used to measure and record seismic waves
- 16. Name of the ancient supercontinent when it was all one landmass
- 19. tectonic plates move towards each other usually forms mountains and volcanoes
- 20. Rock formed when lava or magma cools and hardens