1. Ch. 3 The Rock and Fossil Record Review

2. Which of the following words describes change according to the principle of uniformitariansim?
Sudden
Rare
Global
Gradual
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3. Scientists who study past life including fossils of plants and animals are called . . .25 27
Archeologists
Anthropologists
Uniformitarianists
Paleontologists

4. Determining whether an object is older or younger than other objects is called . .
Relative dating
Superposition
Absolute dating
Geologic dating
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5. Molten rock that squeezes into existing rock and cools is called
Fold
Fault
Intrusion
Unconformity
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6. Fossils are most often preserved in
Ice
Rock
Amber
Tar pits 24 of 27

7. A cavity in rock where a plant or animal was buried is called
Cast
Mold
Imprint
Trace fossil 25 of 27

8. What is an index fossil?
A naturally preserved fossil that shows evidence of animal activity.
Tracks, burrows, nests of extinct animal.
A fossil of an organism that lived during a relatively short well-defined time span.
A fossil that represents a missing part of the geologic column
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9. Erosion and nondeposition cause
Folding
Cross cutting
Intrusions
Unconformities 22 of 27

10. All of the following are types of unconformities EXCEPT . . .
Angular unconformities
Anticonformities
Disconformities
Nonconformities 20 of 27

11. Which of the following is in the correct order from largest to smallest amounts of time?
Eon, era, period
Epoch, era, period
Epoch, period, era
Period, era, eon 21 of 27

12. The Cretaceous, Jurassic and Triassic time periods were in what era?23 27
Cenzoic
Paleozoic
Phanerozoic
Mesozoic

13. Which of the following were NOT in the Paleozoic Era?
Permian
Archeon
Silurian
Ordivician 22 of 27

14. What eon, era and period do we live in?
Proterzoic, Cenozoic, Tertiary
Phanerozoic, Cenozoic, Quarternary
Paleozoic, Quarternary, Tertiary
Hadeon, Phanerozoic, Quarternary 20 of 27

15. The principle that outlines how rocks like undisturbed sequences with the older rocks on the bottom is called . . .
Relative dating
Radiometric dating
Superposition
Law of cross cutting 22 of 27

16. An unstable isotope is called the . .
Son isotope
Daughter isotope
Grandparent isotope
Parent isotope
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17. Of the following isotopes, which is stable?
uranium-238
carbon-12
potassium-40
carbon-14
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18. Which method of radiometric dating is used mainly to date the remains of organisms that lived within the last 50,000 years?
carbon-14 dating
potassium-argon dating
uranium-lead dating
rubidium-strontium dating
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19. The largest divisions of geologic time are called . . .20 27
Periods
Eons
Eras
Epochs

20. To determine the most accurate and precise age of Earth’s oldest rocks, geologists would use
Relative dating
The uranium-lead method
The carbon-14 method
Index fossils 20 of 27

21. Which of the following processes always occurs at a steady rate?
Erosion
Decay of organic matter
Sediment deposition
Radioactive decay 19 of 27

22. Which of the following is correct from oldest to youngest?
3, 1, 6, 5, 4, 2
2, 4, 5, 3, 6, 1
4, 5, 2, 3, 6, 1
5, 4 , 2, 6, 1, 3
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23. If a rock started with 260 g of potassium and 0 g of argon and had a half life of 10 years, how much potassium would be left after 4 half lives?
40 years
54 grams
32.5 grams
16.25 grams
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24. If after 3 half lives there was only 8 grams of parent carbon 14 left, how much carbon was there to start with if the half life of carbon is 5,715 years long?
1 gram
64 grams
17,415 years
32 grams
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25. How many years would it take for a 120 kg of a radioactive isotope to decay to 3.75 kg if the half life for that isotope was 3 years?
15 years
12 years
40 years
32 years 20 of 27