Restless earth

1. Name of the ancient supercontinent when it was all one landmass
5. Formed at plate boundaries usually when plates collide
7. Large rigid pieces of the earth's lithosphere that move and interact with each other along plate boundaries
8. Tectonic plates move toward each other, usually forms mountains and volcanoes
9. Tectonic plates move away from each other, usually forms and rift valleys
12. Hot material rises cooler materials sink, it drives plate tectonics
15. The semi-fluid layer of the mantle where convection currents happen
16. Includes the crust and upper part of the mantle and is divided into tectonic plates
17. Located between the mantle and the outer core
19. Where tectonic plates SLIDE past each other, causes earthquakes
20. Instruments used to measure and record seismic waves
21. An opening in Earth's crust through which molten rock is pushed out and creates new rock

2. Extinction events that occur over a longer time period
3. Fractures or zones of weakness in the Earth's crust
4. Sudden events that led to a mass extinction
6. Deep elongated depressions in the ocean, often associated with subduction zones
10. Rock formed when lava or magma cools and hardens
11. A group of the same species living in the same area
13. Forms after weathering and erosion when sediments compact and cement
14. Formed as a result of high temperature and pressure deep within earth changing a rock that already existed
18. New oceanic crust is formed as tectonic plates pull apart and magma rises