Across
- 2. sudden events that led to a mass extinction
- 5. hot material rises, cooler materials sink. It drives plate tectonics.
- 8. a group of the same species living in the same area
- 9. includes crust and upper part of the mantle
Down
- 1. extinction events that occur over a longer period of time
- 3. forms after weathering and erosion when sediments compact and cement
- 4. formed as a result of high temp. and pressure deep within the earth changing a rock that already exists
- 6. rock formed when lava or magma cools and hardens
- 7. instruments used to measure and record seismic waves