11.09 Telling geologic time Flashcards
1
Q
When does Bishop Ussher think the age of the Earth is?
A
22/23 October 4004 BC
2
Q
How does the ocean get salty?
A
- Rivers carry water and solutes to ocean.
- Solutes left behind in evaporation.
- Concentration of solutes can be used to calculate age of the Earth.
3
Q
How old did Edmond Halley think the Earth was?
A
- 99.3 million years
- Using the salty method.
4
Q
How old did Darwin say the Earth was (erosion method)?
A
306 million years. Using uniform rates of erosion.
5
Q
Three laws of Thermodynamics
A
- Conservation: total energy of isolated system remains constant.
- Entropy in a closed system never decreases, only stays the same or increases.
- At absolute zero, entropy of a system reaches minimum possible state.
6
Q
Kant’s nebular hypothesis
A
- Solar system formed by gravitational collapse of dust and gas.
- Gravitational collapse = increase in temp.
- Given openness of solar system, system must cool down.
7
Q
What did Kelvin say the age of the Earth was?
A
400 million years.
Based on thermodynamics.
8
Q
Isotopes
A
Atoms w same number of protons but different number of neutrons.
