Ch 21 Geologic Time Review

Which of these is most likely to have soft parts still?

• petrified eggs

• a lizard in amber

• a leaf imprint

• a cast of a shell

All of these are used to divide the Geologic Time Scale into smaller units of time for study except for...

• eon

• era

• epoch

• epilogue

Tags

NGSS.MS-ESS1-4

Which fossils are the oldest?

• layer U

• layer R & VI

• layer P & IV

• layer II

Tags

NGSS.MS-ESS1-4

NGSS.MS-LS4-1

Which of these fossil types shows original preservation?

• frozen

• petrified

• trace fossils

• molds & casts

Which of these correctly describes relative dating?

• It compares a fossil’s placement in layers of rock with other fossil layers.

• It determines the precise age of a fossil in years.

Scientists use all of these to determine the exact ages of rocks, except for...

• half-lives

• radioactive decay

• isotopes

• superposition

Tags

NGSS.HS-PS1-8

Which of these is the era that we are in right now?

• Paleozoic

• Mesozoic

• Cenozoic

Older rocks are closer to Earth’s surface than more recent layers.

• true

• false

Tags

NGSS.MS-ESS1-4

The length of time required for half of the radioactive atoms in a sample to decay is its...

• half-life.

• radioactive date.

• relative date.

• period.

Tags

NGSS.HS-PS1-8

A scientist has found a fossil in the layers of shale along a highway in Kentucky. She thinks the fossil may be from the Devonian Period, which lasted 408 to 360 million years ago. Which radioactive element should she use to determine the age of the bones?

• Chlorine-36

• Radium-226

• Uranium-235

• Carbon-14

Tags

NGSS.MS-ESS1-4