Dating Quiz

If carbon-14 has a half life cycle of 5700 years, how many years have past if only 12.5% of it remain in an ancient sample?

• 712 years

• 5,700 years

• 11,400 years

• 17,100 years

• 22,800 years

After 24.0 days, 2.00 milligrams of an original 128.0 milligram sample remain. How many half lives have occurred?

• 0

• 2

• 4

• 6

• 5

A half-life is the ________ it takes for ________ of the radioactive element to __________

• amount of energy, 50%, decay

• time, 50%, decay

• amount of energy, 50%, liquefy

• time, 50%, liquefy

A radioactive element has a half-life of 20 years. A rock contains 25% radioactive material. How old is that rock?

• 20

• 40

• 60

• 80

The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?

• 50 g

• 25 g

• 12.5 g

• 75 g

• 6.25 g

How do you read a geologic time scale?

• The youngest division of time is at the bottom and moving upward everything gets older

• The oldest division of time is at the bottom and moving upward everything gets younger

• The oldest division of time is in the middle and everything moving outward is younger

How is absolute dating different than relative dating?

• Relative time is scientific whereas absolute time is pseudoscientific (appears scientific but really isn't)

• Absolute time is scientific whereas relative time is pseudoscientific (appears scientific but really isn't)

• Relative is expressed in a definite number whereas absolute time does not have an exact date, only establishes a sequence (estimated time)

• Absolute dating is expressed in a definite number whereas relative dating does not have an exact date, it only establishes a sequence (estimated time)

What is the correct order of 5 subsequent layers of this section? Left being the oldest, right being the youngest.

• F E D C L

• H L B J G

• M I F E D

• N M O I F

Feature N represents a....

• Angular unconformity

• Igneous intrusion

• Fault

• non-conformity

What does letter "L" represent?

• Fault

• Igneous intrusion

• Non-confirmity

• Angular unconformity

• Disconformity