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WorksheetsUnit 6 Review
Total questions: 16
Worksheet time: 15mins
Which law states that younger rocks lie above older rocks if the layers have not been disturbed?
superposition
cross-cutting
unconformity
uniformitarianism
Explain the difference between Relative Dating and Absolute Dating.
The original element that undergoes radioactive decay is known as the _______.
daughter element
half-life
parent element
carbon-14
Examine this table of different Radioactive elements and the number of years half of their atoms decay.
How many years would pass if only 12.5% of the Carbon-14 radioactive elements are left?
The percent of the parent isotope remaining after 4 Half-Lives is ____.
50%
25%
12.5%
6.25%
What is the correct order of the rock layers from oldest to youngest?
B, C, D, E, A
E, D, C, B, A
A, B, C, D, E
B, C, D, A, E
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
What law states that any geologic feature that cuts across other layers is younger than layers it cuts across?
Law of superpostion
Law of layers
Law of inclusion
Law of crosscutting
Unstable atoms that decay (change) are considered radioactive _________.
Isotopes
Half-Life
Absolute Dating
Radiometric Dating
When did a mass extinction of dinosaurs and many land plants occur? (NOTE: use pages 8 & 9 of your ESRT)
65.5 mya
251 mya
300 mya
440 mya
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?
zero
1
2
3
An archeologist found an ancient skeleton estimated to be 10,000 to 25,000 years old. Which radioactive isotope would be the most useful for finding the age of the skeleton?
Carbon-14
Potassium-40
Uranium-238
Rubidium-87
