Geologic Time

About how old is the Earth believed to be?

• 4.6 billion years old

• 3.6 billion years old

• 2.5 billion years old

• 7 billion years old

Which is more accurate, relative age, or absolute age?

• Relative Age

• Absolute Age

Can Radiometric Dating be done on Sedimentary rocks?

• Yes

• No

• Sometimes

Why can't Radiometric Dating be done on Sedimentary rocks?

• because they have fossils in them

• because they don't have any chemicals in them

• because the rock wouldn't be dated, the different sediments would be

True or False: Index Fossils are widely distributed organisms that lived for a very long period of time.

• True

• False

Which unit of time is larger?

• Year

• Period

• Century

• Era

What does the Law of Superposition state?

• Each rock layer is older than the one below it

• Each rock layer is younger than the one below it

• Rock layers do not have an age order

What is the Geologic Time Scale?

• a record of Earth's life forms and geologic events

• a record of U.S. events

• an igneous rock layer

• the age of rock compared to the age of other rocks