Exploring Absolute Age of Rocks

The video tutorial covers the concept of radioactive decay, explaining how it involves the breakdown of radioactive elements at a constant rate, and introduces the concept of half-life. It discusses how geologists use radioactive dating to determine the absolute ages of rocks by comparing the amount of radioactive elements to stable elements. The video also explains carbon dating, detailing how scientists measure the ratio of carbon-14 to carbon-12 to determine the age of fossils. It concludes with an example of interpreting carbon dating results using a graph.

What is radioactive decay?

• The breakdown of a radioactive element releasing particles and energy

• The process of an element gaining protons

• The fusion of two elements

• The process of an element losing electrons

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NGSS.HS-PS1-8

What is the half-life of a radioactive element?

• The time it takes for all atoms of a radioactive element to decay

• The time it takes for a radioactive element to double in quantity

• The time it takes for half of the atoms of a radioactive element to decay

• The time it takes for a radioactive element to become stable

Tags

NGSS.HS-PS1-8

After one half-life, what percentage of the original parent element remains?

• 100%

• 75%

• 50%

• 25%

How do geologists determine the absolute age of rocks?

• By measuring the rock's temperature

• By counting the number of layers in the rock

• By comparing the amount of radioactive element to the stable element

• By measuring the amount of water in the rock

What is the primary element used in carbon dating?

• Carbon-14

• Carbon-12

• Oxygen-16

• Nitrogen-14

How is carbon-14 created in the atmosphere?

• By the interaction of oxygen and carbon dioxide

• By the decay of carbon-12

• By cosmic rays hitting nitrogen atoms

• By the fusion of hydrogen atoms

What happens to carbon-14 in an organism after it dies?

• It remains constant

• It increases

• It starts to decay into nitrogen

• It turns into carbon-12

Tags

NGSS.HS-PS1-8

What is the half-life of carbon-14?

• 5,730 years

• 10,000 years

• 1,000 years

• 100,000 years

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NGSS.HS-PS1-8

If a fossil has one-eighth of its original carbon-14, how many half-lives has it gone through?

• 4

• 3

• 2

• 1

Up to how many years can carbon dating be used to date fossils?

• 100,000 years

• 60,000 years

• 30,000 years

• 10,000 years