1. Jeopardy Final Jeopardy Decay Layers Fossils Time $100 $100 $100 $100
$200
$200
$200
$200
$300
$300
$300
$300
$400
$400
$400
$400
Final Jeopardy

2. 1 - $100
This dating method uses radioactive isotopes and known decay rates of atoms.
Absolute dating

3. 1 - $200
Radiometric dating can only be used to date what two types of rock?
Igneous and Metamorphic

4. 1 - $300
Two atoms of the same element with different numbers of __________ are known as _______.
Neutrons, Isotopes

5. 1 - $400
Half-life
Parent-Daughter ratio
Amount of parent remaining
1:0
1/0 = 100% 1
1:1
1/2 = 50% 2
1:3
1/4 = 25% 3
1:7
1/8 = 12.5%
Radioactive Isotope
Daughter Isotope
Half-life (years)
Effective dating range (years)
Carbon-14
Nitrogen-14
5730
100 – 75,000
A sample of charcoal contains 10 atoms of Carbon-14 for every 30 atoms of Nitrogen-14. How old is the site?
11,460 years

6. 2 - $100
This geologic principle states that any igneous intrusion or or earthquake fault line will be younger than rock layers they impact.
Principle of cross-cutting

7. 2 - $200
List the geologic layers and features from oldest to most recent.
C – B – A – D – E

8. 2 - $300
The geological feature E represents a fault line. What type of fault is represented.
(Normal, Strike-slip, or Reverse)
Normal

9. 2 - $400
Layer A is younger than layer B because of what geological principle or law?
Law of Superposition

10. 3 - $100
A trace fossil can be tracks of ancient animals, burrows, and _________, the name given to fossilized dung?
Coprolite

11. 3 - $200
Known as a Nodosaur, this 110 million-year-old, armored plant-eater is the best preserved fossil of its kind ever found with skin and shell tissue impressions intact. What type of fossil does this specimen represent?
Petrified

12. 3 - $300 A fossil that keeps actual soft tissue, and often DNA intact.
Preserved remains

13. 3 - $400
A fossil that has a wide distribution over a short span of geologic time that can be used to date other fossils and geologic events.
Index fossil

14. 4 - $100
How long ago did the K-T (cretaceous-tertiary) extinction event occur?
66 million years ago

15. 4 - $200
Trilobites were one of many organisms that disappeared from the fossil record after the 2nd great mass extinction event. This event led to the loss of ____ % of species on Earth.
75%

16. 4 - $300
Carbon-14 is created when cosmic rays strike this element (the most abundant gas in the atmosphere).
Nitrogen

17. 4 - $400
The name given to the last 11,700 years* of the Earth's history — the time since the end of the last major glacial epoch, or "ice age."
Holocene

18. Final Jeopardy
This type of crystal is used for accurate radiometric dating using uranium-238 because it strongly repulses lead when it is formed in cooling igneous rock.
Zircon crystal