Across
- 3. A subdivision of a geologic period
- 4. the study of the origin, history, and structure of Earth
- 7. Tectonics A theory stating that the earth's surface is broken into plates that move
- 9. Process in which sediment is laid down in new locations
- 10. a crack in the earth's crust, usually along a lithospheric plate boundary
Down
- 1. A unit of geological time into which eras are divided.
- 2. core A long cylinder of ice obtained from drilling through icecaps or ice sheets; used to study past climates
- 5. A long and distinct period of history with a particular feature or characteristic
- 6. dating any method of measuring the age of an object or event in years
- 8. the largest division of time