Dating the Earth

Front

What is the oldest layer in a geological sequence?

Back

Layer E is the oldest layer.

Tags

NGSS.MS-ESS1-4

Front

List the geological layers in order from oldest to youngest.

Back

E, B, C, D, A.

Tags

NGSS.HS-ESS1-5

Front

What is radiometric dating?

Back

Radiometric dating is a method used to date materials by comparing the abundance of radioactive isotopes and their decay products.

Tags

NGSS.HS-PS1-8

Front

Why are the rates of decay of radioactive isotopes important in radiometric dating?

Back

The rates of decay of radioactive isotopes are constant, allowing for accurate dating of materials.

Tags

NGSS.HS-PS1-8

Front

How do ice cores provide evidence for the evolution of Earth's atmosphere?

Back

Ice cores can show how the composition of the atmosphere has changed over time.

Front

What is an index fossil?

Back

An index fossil is a fossil that is used to define and identify a particular time period in the geological time scale.

Front

Which fossil is considered the best index fossil?

Back

Fossil 2 is considered the best index fossil.

Tags

NGSS.HS-LS4-1

NGSS.HS-LS4-5

Front

What is the principle of superposition in geology?

Back

The principle of superposition states that in an undeformed sequence of sedimentary rocks, the oldest layers are at the bottom and the youngest are at the top.

Tags

NGSS.MS-ESS1-4

Front

What role do radioactive isotopes play in dating geological materials?

Back

Radioactive isotopes decay at a constant rate, which allows scientists to calculate the age of geological materials.

Tags

NGSS.HS-PS1-8

Front

What is the significance of the Law of Original Horizontality?

Back

The Law of Original Horizontality states that layers of sediment are originally deposited horizontally under the action of gravity.

Tags

NGSS.MS-ESS1-4