Absolute Dating and Geologic time

Numerical age dates based on radioactivity are very important for the studying of Precambrian geologic history because fossils are rare or absent.

• True

• False

The process by which atomic nuclei decay is called ______

• deposition

• erosion

• relative dating

• radioactivity.

Tags

NGSS.HS-PS1-8

Which of the following denotes the divisions of the geologic time scale in correct order of decreasing lengths of time beginning with the longest time interval and ending with the shortest?

• eon, era, period, epoch

• era, period, epoch, eon

• eon, era, epoch, period

• eon, epoch, period, era

Tags

NGSS.MS-ESS1-4

Which of the following is not a very long-lived, radioactive isotope?

• K-40

• C-14

• U-238

• Rb-87

Tags

NGSS.HS-PS1-8

Consider the names of the eras in the geologic time scale. What is meant by "zoic"?

• places; geographic references

• time; recording of events

• life; living things

• rocks; lithified strata

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

Which of the following describes radioactive decay by beta particle emission?

• The daughter isotope has an atomic number one less than the parent and a mass number two less.

• The atomic number of the daughter isotope is one more than the parent; the mass numbers are the same.

• The daughter isotope has an atomic number two less than the parent and a mass number four less.

• The mass number of the daughter isotope is one more than the parent, and both isotopes have the same atomic number.

Tags

NGSS.HS-PS1-8

About 88 percent of geologic time is represented by the time span called the ________.

• Mesozoic

• Precambrian

• Phanerozoic

• Paleozoic

Tags

NGSS.MS-ESS1-4

After two half-lives there is no longer any of the original radioactive material remaining

• True

• False

Tags

NGSS.HS-PS1-8

The ratio of parent to daughter isotopes in a radioactive decay process is 0.40. How many half-lives have elapsed since the material was 100% parent atoms?

• more than 3

• less than l

• between l and 2

• between 2 and 3

Tags

NGSS.HS-PS1-8

What are the mass and charge of an alpha particle?

• 4, +2

• 0, +1

• 4, -2

• 0, -1

Tags

NGSS.HS-PS1-8