Across
- 2. Negative charge
- 4. Original isotope
- 6. smallest whole piece of matter
- 8. 92 are naturally occuring on Earth
- 10. summary of major events in all of Earth's past that are preserved in the rock record
- 11. relative order without determining their absolute age
- 12. very powerful radiation, can damage DNA
- 13. nucleus vibrates until protons or neutrons are rejected to reach equalibrium
- 15. time it takes for a half the radioactive element to decay into a stable element
- 16. No Charge
Down
- 1. atom of the same element that have a different number of neutrons
- 3. the process by which radioactive isotopes give off or capture parts of the atom
- 4. positive cahrge
- 5. vertical column of rock that demonstrates the Law of Superposition and can include fossils
- 6. procedures a numerical age
- 7. stronger radiation, can penetrate human skin
- 9. the conversion of an atom of one element to an atom of another
- 14. very weak radiation, won't penetrate paper