Across
- 4. tectonic plates move away from each other and form new crust or a rift valley
- 5. the semi-fluid layer of the mantle where convection currents happen
- 10. hot material rises and colder material sinks
- 11. rock formed when lava or magma cools and hardens
- 12. fractures or zones of weakness in earth's crust
- 16. large rigid pieces of the Earth's crust that move and interact with eachother
- 17. a group of the same species living in the same area
- 18. tectonic plates move toward each other and form mountains and volcanoes
- 20. the uppermost layer of earth including the crust and upper mantle
- 21. formed as a result of high temperature and high pressure environments
Down
- 1. extinction events that occur over a long time period
- 2. sudden events that lead to a mass extinction
- 3. where tectonic plates slide past each other causing earthquakes
- 6. name of the ancient supercontinent when it was all one landmass
- 7. instruments used to measure seismic waves
- 8. new oceanic crust is formed as tectonic plates pull apart
- 9. an opening in the earth's crust that releases molten rock from the mantle
- 13. deep elongated depressions in the ocean
- 14. formed at plate boundaries when plates collide
- 15. located between the mantle and outer core
- 19. forms after weather and erosion when sediments compact and cement