Radiometric Dating

3. I am a naturally occurring inorganic element or compound
6. I an the same element and protons but my neutrons are different
7. I used observations of rocks and fossils to piece together an understanding of how Earth has changed
8. i made my way throw earths atmosphere
9. i am a inanimate object that help scientists hypotheses earths past
11. nucleus of an unstable atom loses energy by emitting radiation
15. scientists uses nature in order to theorize the age of objects
17. i studie solids, liquids and gases
18. I am another word for the core or center of something
20. I am a element known as "C"

1. I am the process of rocks eroding from wind and water
2. i am known as earth inhabitants
4. i am the time taken for the isotope to decrease into half its original value
5. i date geological specimens by determining the relative proportions of particular radioactive isotopes
10. I am found further into the earths ground
12. I am found closest to the earth surface
13. I was created over 4.6 billion years ago
14. I am the tiniest particle in the world
16. i am the exact age of a fossil/rock
19. i am the remains of a decomposed prehistoric animal