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