vocab crossword

3. forms after weathering and erosion when sediments compact and cement
4. large rigid pieces of the earths lithosphere that move and interact with each other along plate boundaries
7. tectonic plates move toward each other usually forms mountains and volcanoes
8. formed as a result of high temperature and pressure deep within the earth changing rock that already exists
11. name of ancient super continent when it was all one land mass
12. an opening in the earths crust through which molten rock is pushed out and creates new rock
17. sudden event that led to mass extinction
19. hot material rises cooler materials sink it drives plate tectonics
21. instruments used to measure and record seismic waves

1. the semi fluid layer of the mantle where convection currents happen
2. tectonic plates move away from each other usually forms new crust and rift valleys
5. formed at plate boundaries usually when plates collide
6. where tectonic plates slide past each other causes earth quakes
9. a group of the same species living in the same area
10. extinction events that occur over a longer time period
13. located between the mantle and the outer core
14. deep elongated depressions in the ocean often associated with subduction zones
15. new oceanic crust is formedas techtonic plates pull apart and magma rises
16. fractures or zones of weakness in the earths crust
18. includes the crust and upper part of the mantle and is divided into tectonic plates
20. rock formed when lava or magma cools and hardens