Earth Science, Friday Bell Ringer, 1.4.19

Relative Dating dates rocks __________
Absolute Dating dates rocks __________

• exact age; sequence
• sequence; exact age
• exact age; parent isotopes
• Laws; Isotopes

Tags

NGSS.MS-ESS1-4

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

The original element that undergoes radioactive decay is known as the...

• daughter element
• half-life
• parent element
• carbon-14

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

What percent of carbon-14 would be left after 11,460 years? (2 half lives)

• 100%
• 75%
• 50%
• 25%

Tags

CCSS.HSF.LE.A.4

If the half-life of a radioactive group of atoms is 100 years, then how old is the rock if the parent decays to 25%?

• 25 years
• 200 years
• 400 years
• 800 years

Tags

CCSS.HSF.LE.A.4

The Earth is estimated to be how old?

• 4.6 Million years old
• 6,000 years old
• 4.6 Billion years old
• Who knows

Tags

NGSS.HS-ESS1-6

Why are isotopes with short half-lives not useful for dating very old rocks?

• because not enough of the parent isotope remains to measure accurately
• because not enough of the daughter product has formed to be detectable
• because neither the parent isotope nor the daughter product will be detectable
• because very old rocks would never have contained these isotopes

Tags

NGSS.HS-PS1-8

What is radio active decay?

• The preserved remains of an organism.
• Atoms in an unstable element break down to form another element.
• When things die and their remains are buried.
• The time it takes for 1/2 of the radioactive atoms to decay in an element.

Tags

NGSS.HS-PS1-8