Earth History Review

Front

What does the fossil record indicate about life forms on Earth?

Back

Most life forms that existed on Earth are now extinct.

Tags

NGSS.HS-LS4-5

Front

What technological process is used to determine the age of the Earth?

Back

Radiometric dating of rocks in the Earth's crust.

Tags

NGSS.HS-ESS1-5

NGSS.HS-ESS1-6

Front

How old is the Earth estimated to be?

Back

4.6 billion years old.

Tags

NGSS.HS-ESS1-6

Front

What do air bubbles in ice cores tell us?

Back

They provide information about the atmosphere in the past.

Tags

NGSS.HS-ESS1-6

Front

If a radioactive sample has decayed to 25% of its original amount, how many half-lives have occurred?

Back

2 half-lives.

Front

What is radiometric dating?

Back

A method used to date materials by comparing the abundance of a radioactive isotope to its decay products.

Tags

NGSS.HS-PS1-8

Front

What is a half-life?

Back

The time required for half of a radioactive sample to decay.

Tags

NGSS.HS-PS1-8

Front

Why are ice cores important for studying Earth's history?

Back

They contain trapped air bubbles that provide data on past atmospheric conditions.

Tags

NGSS.HS-ESS1-6

Front

What is the significance of the 4.6 billion year estimate for Earth's age?

Back

It provides a timeline for the formation of the Earth and the development of life.

Tags

NGSS.HS-ESS1-6

Front

What can the extinction of species tell us about Earth's history?

Back

It indicates changes in environmental conditions and mass extinction events.

Tags

NGSS.HS-LS4-5