Q14- Relative and Absolute Dating

How old is a bone that has 12.5% of the original amount of radioactive carbon-14 remaining?

• 5,700 years

• 11,400 years

• 17,100 years

• 22,800 years

An archeologist found an ancient skeleton estimated to be 10,000 to 25,000 years old. Which radioactive isotope would be most useful for finding the age of the skeleton?

• carbon-14

• potassium-40

• uranium-238

• rubidium-87

If a rock has 50% radioactive material present how many half lives have gone by?

• 1

• 2

• 3

• 4

if the half life of Potassium-40 is 1.3 billion years and there is 12.5% radioactive material left in the mineral. How old is that rock?

• 2.6 billion

• 3.9 billion

• 1.3 billion

• 5.2 billion

Uranium eventually decays into what element?

• Helium (He)

• Argon (Ar)

• Lead (Pb)

• Nitrogen (N)

A break in the geologic record that is made when rock layers are eroded over a long period of time

• Law of Superposition
• Law of Crosscutting
• Relative Dating
• Unconformity

How do geologists use relative dating?

• Placing rocks in order from youngest to oldest
• Placing rocks in order by minerals they contain
• Classifying rocks by different textures
• Classifying rocks by different isotopes

Tags

NGSS.MS-ESS1-4

Which of the following correctly lists the layers in order from oldest to youngest?

• A, B, C, D, E
• E, B, C, D, A
• E, D, C, B, A
• C, B, A, D, E

Tags

NGSS.MS-ESS1-4

The rock formation labeled "P" is a(n)...

• fault
• intrusion
• inclusion
• unconformity

Letter "F" is a....

• inclusion
• intrusion
• fault
• unconformity