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