Geologic Time Scale

Front

What is the purpose of the geologic time scale?

Back

To identify when events occurred in Earth's history

Front

What is the longest time period in the geologic time scale? Options: Period, Epoch, Eon, Era

Back

Eon

Front

What is the shortest time frame in the geologic time scale? Options: Eon, Era, Period, Epoch

Back

Epoch

Front

What is the duration of an Era?

Back

Few hundred million years

Front

What is the duration of a Period?

Back

Tens of millions of years

Front

What is the duration of an Eon?

Back

Hundreds of millions of years

Front

What is the most recent time period in Earth's history?

Back

Cenozoic Era

Front

What is the oldest time period in Earth's history? Options: Early Archean Era, Paleozoic Era, Cenozoic Era, Mesozoic Era

Back

Early Archean Era

Front

Law of Superposition

Back

Older rocks and fossils are buried below newer, younger rocks and fossils

Front

What is the significance of fossils in dating Earth's history?

Back

They provide evidence of organisms that existed during a previous time in Earth's history