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- 1. Multiple ChoiceIf the half-life of a radioactive group of atoms is 100 years, then how old is the rock if there have been ten half-lives?10 years100 years1000 years10000 years
- 2. Multiple ChoiceThe time it takes for 50% of the nuclei in a radioactive sample to decay to its stable isotope is called _____.the daughter productgeologic timethe half-lifethe half-time
- 3. Multiple Choice
You find a rock sample with radioactive atoms present. If 12.5% of the original radioactive atoms were present, how many half-lives has the rock been around for? (Hint, at Half-Life = 0, you start with 100%)zero123 - 4. Multiple ChoiceYou find a rock sample with radioactive atoms present. If 25% of the original radioactive atoms were present, how many half-lives has the rock been around for? (Hint, at Half-Life = 0, you start with 100%)zero123
- 5. Multiple ChoiceSuppose you found a material in which 12.5% of the original radioactive atoms were still present. If the half-life of an atom is 60 years, how old is the material?30 years old60 years old120 years old180 years old
- 6. Multiple ChoiceThe table shows the radioactive decay of carbon-14. Part of the table has been left blank.
After 22,800 years, approximately what percentage of the original carbon-14 remains?15%12.5%6.25%3.125% - 7. Multiple ChoiceThe graph shows the generalized rate of decay of radioactive isotopes over 5 half-lives.
If the original mass of a radioactive isotope was 24 grams, how many grams would remain after 3 half-lives?122436 - 8. Multiple ChoiceThe graph shows the radioactive decay of a 50-gram sample of a radioactive isotope.
According to the graph, what is the half-life of this isotope?100 years150 years200 years300 years - 9. Multiple ChoiceWhen an unstable radioactive atom decays, it usually turns into:a more stable atoma less stable atomthe exact same atom but with less pure energyempty space
- 10. Multiple ChoiceIf the half-life of a radioactive group of atoms is 100 years, then how old is the rock if there have been two half-lives?25 years200 years400 years800 years
- 11. Multiple ChoiceWhy are isotopes with short half-lives not useful for dating very old rocks?because not enough of the parent isotope remains to measure accuratelybecause not enough of the daughter product has formed to be detectablebecause neither the parent isotope nor the daughter product will be detectablebecause very old rocks would never have contained these isotopes
- 12. Multiple ChoiceScientists use radioactive decay to measure...relative timeabsolute timehalf-livestime of day
- 13. Multiple ChoiceHow does absolute age differ from relative age?only absolute dating indicates which rock is older than anotheronly absolute dating finds the age in yearsonly relative dating finds the age in years
- 14. Multiple ChoiceWhat element is usually used to date fossils?uranium-235carbon-14mercury-203thorium-234
- 15. Multiple ChoiceAll plants and ANIMALS contain carbon.TrueFalse
- 16. Multiple ChoiceWhich of the following correctly lists the layers in order from oldest to youngest?A, B, C, D, EE, B, C, D, AE, D, C, B, AC, B, A, D, E
- 17. Multiple Choice
If the half-life of an element is 33 years, how long will it take for ¼ of the original amount
33
66
99
49
- 18. Multiple Choice
What is the correct order of the rock layers from oldest to youngest?
F, E, C, B, A, D
F, E, D, C, B, A
A, B, C, D, E, F
D, F, E, C, B, A
- 19. Multiple ChoiceAfter the third half-life, how much of the sample is left?1/21/31/161/8
- 20. Multiple ChoiceThe age of a rock compared to the ages of other rocks is the rock'sabsolute agegeologic agesedimentary agerelative age
- 21. Multiple ChoiceWhich rock layer or intrusion is the youngest?ABCD
- 22. Multiple ChoiceArcheologists have found a fossil that contains 87.5 grams of nitrogen-14 and 12.5 grams of carbon-14. The half life of carbon-14 is 5730 years. How old is the fossil?3 million years17,190 years11,460 years92,000 years
- 23. Multiple ChoiceThe original element that undergoes radioactive decay is known as the...daughter elementhalf-lifeparent elementcarbon-14
- 24. Multiple ChoiceA rock formed with 1000 atoms of a radioactive parent element, but only contains 250 radioactive parent atoms today. If the half-life of the parent element is one million years, how old is the rock?250,000 years old500,000 years old1,000,000 years old2,000,000 years old
- 25. Multiple Choicegaps in rock layers caused by erosion are calledlaw of superpositionunconformitiesuniformitarianismrelative dating
- 26. Multiple Choicestates that the geologic feature which cuts another is the younger of the two featureslaw of horizontalitycross cutting relationshipslaw of superpositionuniformitarianism
- 27. Multiple Choicewhat's the half life of this substance?1 day5 days3 days9 days
- 28. Multiple Choice
When an unstable radioactive atom decays, it usually turns into:
a more stable daughter atom
a less stable daughter atom
the exact same atom but with less pure energy
empty space
- 29. Multiple ChoiceWhat is the law of superposition?The age of sedimentary rock not found in the original layers.Metamorphic rock is younger than the nearby igneous rock.Sedimentary rock in it's original position is older than layers above it.Metamorphic rock is older because it was deposited to nearby sedimentary rock.
- 30. Multiple Choice
Which is true of a index fossil?
It is not unique
it existented for a long time
It is found in only one rock layer
It is still alive today
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