Across
- 2. First vocab term on page 215
- 5. division of geological time into which eras are subdivided
- 6. Hot layer of rock beneath the Earth's crust
- 7. outermost part of the geosphere made up of the crust and mantle, "sphere of stone"
- 9. Incredibly hot metal layer at the center, beneath the Earth's mantle
- 10. breaking down or chemically changing rocks and minerals
- 12. Distinctive fossils used to compare the relative ages of fossils
- 14. Placing rocks in chronological order, determining the age of a fossil
Down
- 1. Time required for half of the radioactive atoms in a sample to decay
- 3. last name of the teacher of this class
- 4. something you spend most of your time on, you might be using it right now
- 5. Geological processes, like earthquakes, resulting from plate movement
- 8. timeline used to represent Earth's history
- 11. Earth's thin and solid outer skin
- 13. major division of geologic time