Finding Earth's Age (8.E.2.1)

Which statement is true?

• Layer A is older than layer B.

• Layer A is older than layer C.

• Layer B is older than layer A.

Which statement is true about index fossils?

• Index fossils are fossils that show organisms that are alive today.

• Index fossils are organisms that were fossilized a long time ago during a specific time period.

• Index fossils are organisms that are just a specific organism.

Which choice below is the best way to determine when a species became extinct?

• examining organisms alive today

• observing rock layers

• studying the DNA of the organism

What is the relationship between a fossil and the sedimentary rock the fossil was found in?

• the fossil was formed before the rock

• the fossil and rock were formed around the same time

• the rock was formed before the fossil

What can scientists learn from the fossilized shark tooth?

• scientists can compare the fossilized tooth to sharks that living today

• scientists can observe the color of the skin of the shark

• scientists will know how the shark died

Which method below can be used to determine the relative age of rock layers?

• Law of Superposition

• Radiometric dating

• Absolute Dating

• Radioactive Dating

Which method below can be used to determine the actual age of a fossil?

• Law of Superpositon

• Radiometric Dating

• Relative Age

• Speed Dating

Relative dating gives me:

• Exact age

• Tells me if something is younger or older than something else

• Is only used to determine the age of fossils from 1 million years ago

Index fossils help us determine the age of something. They are used because: (THERE ARE TWO ANSWERS)

• They lived for a short period of time

• They are widely distributed

• They lived for a long period of time

• They lived in only one area

Absolute dating tells us:

• a more exact age than relative dating

• An estimate of how old something is by comparing it to another fossil/rock