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