Absolute Dating

Scientists use radioactive decay to measure...

• relative time
• absolute time
• half-lives
• time of day

Tags

NGSS.HS-PS1-8

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

• era
• age
• half-life
• eon

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

Radiometric dating (absolute 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

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

Geologists use radioactive dating to determine THE ABSOLUTE AGE OF ROCKS.

• True
• False

Tags

NGSS.HS-PS1-8

An element that has broken down and released particles and energy is said to be _______________.

• radioactive
• subatomic

Tags

NGSS.HS-PS1-8

_______________is the method of determining the absolute ages of rocks.

• absolute dating

• carbon-14 dating

Tags

NGSS.HS-ESS1-5

Some ELEMENTS can decay over time.

• True
• False

Tags

NGSS.HS-PS1-8