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