Geologic History and the Evolution of Life

Which layer is OLDER? Layer E or Intrusion A?

• Layer E

• Intrusion A

Tags

NGSS.MS-ESS1-4

Uses radioactive elements near the fossils to determine the actual age of the fossils.

• Relative Dating

• Absolute Dating

When determining absolute age, what is the term used for the amount of time it takes for half of the atoms in a sample of a radioactive element to decay into atoms of another element.

• Half-life

• Radioactive decay

• Radiometric dating

• Decomposition rate

Tags

NGSS.HS-PS1-8

How does absolute age differ from relative age?

• only absolute dating indicates which rock is older than another

• only absolute dating finds the age in years

• only relative dating finds the age in years

Tags

NGSS.HS-ESS1-5

Radiometric dating is possible because the rates of decay of radioactive isotopes _____.

• change over time

• change from place to place

• are constant

• vary widely

Tags

NGSS.HS-PS1-8

If the half-life of a radioactive group of atoms is 100 years, then how old is the rock if there have been two half-lives?

• 25 years

• 200 years

• 400 years

• 800 years

Tags

NGSS.HS-PS1-8

What is the half life of Carbon-14?

• 5730 yrs

• 1.2 billion years

• 713 million years

• 1.3 billion years

Tags

NGSS.HS-PS1-8

What element is usually used to date fossils?

• uranium-235

• carbon-14

• mercury-203

• thorium-234

If the half-life of a radioactive group of atoms is 100 years, then how old is the rock if there 12.5% parent isotope left?

• 50 years

• 100 years

• 200 years

• 300 years

Tags

NGSS.HS-PS1-8

How does the law of crosscutting explain the age of a fault?

• The fault is younger than the rocks above it.

• The fault is younger than the rocks it cuts through.

• The fault is older than the rocks above it.

• The fault is older than the rocks it cuts through.