Across
- 4. named after Hades, because of how chaotic it was. The Archean Eon, was the time the Earth's crust cooled and contents started to form.
- 5. layers
- 8. how long it takes for half of the isotopes in an item to decay
- 9. Rocks found inside of other rocks are the older of the two
- 10. If there is an uninterrupted sequence of rocks then the youngest will be on the top and the oldest will be on the bottom.
Down
- 1. Features like faults and dikes are newer than the rock they cut through
- 2. dating that gives actual age of rocks.
- 3. using half-life data scientists find out how long a rocks isotopes molecules have been decaying.
- 6. prehistoric, plant, animal bones, or gems, that show what things were like in that time period.
- 7. useful for dating and correlating the strata in which it is found.