vocab

2. extinction events that occur over a longer time period.
4. hot material rises, cooler materials sink. it drives plate tectonics.
5. formed at plate boundaries usually when plates collide.
10. tectonic plate move toward each other,usually form mountains and volcanoes.
12. the simi-fluid layer of the mantle where convection currents happen.
16. sudden events that led to a mass extinction.
17. tectonic plates move away from each other, usally from new crust and rift valleys.
18. includes the crust and upper part of the mantle, and is decided into plate tectonics.

1. located between the mantle and the outer core.
3. formed as a result of high temperature and pressure deep within earth changing a rock that already existed.
6. a group of the same species living in the same area.
7. new oceanic crust is formed as tectonic plates pull apart and magma rises.
8. large, rigid peices of the earth's lithosphere that can move and interactv with each other along plate boundaries.
9. rock formed when lava or magma cools and hardens.
11. where tectonic plates SLIDEpast each other.causes earthquakes.
13. name of the ancient supercontinent when it was all one land mass.
14. forms after weathering and erosion when sediments compact and cement.
15. instruments used to measure and record seismic waves.