15.14: Understanding Earth's History- Challenge 3
- Page ID
- 5916
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- 1. The distinctive patterns of tree rings, ice cores, and ___ can be used to determine the time they were formed.
- varves
- 2. The counting of ___ layers is one of the methods of ice core dating.
- dust-snow
- 3. ___ analysis yields clues about how changes in the concentration of atmospheric gases have influenced Earth's climate over time.
- Ice core
- 4. If two half-lives have passed, ___ percent of the parent isotope remains.
- 25
- 5. Radioactive decay of an isotope leads to the formation of a ___ product.
- stable daughter
- 6. ___ discovered the spontaneous emission of particles that they called "radioactivity."
- Pierre and Marie Curie
- 7. When an organism dies, carbon-14 decays to stable nitrogen-14 by releasing a ___.
- beta particle
- 8. Carbon dating measures when an organism died because only then does ___.
- carbon-14 decay into nitrogen-14
- 9. Carbon-14 dating is used for dating human remains and artifacts because ___.
- carbon-14 has a relatively short half-life and early human fossils and materials often contain carbon
- 10. ___ is the most useful technique for dating Earth's matter and coming up with a quantitative age for the planet.
- Radiometric dating
- 11. ___ determines the age of an object based on the concentration of a particular radioactive isotope contained within the object.
- Radiometric dating
- 12. Earth is ___ years old.
- 4.6 billion