# science

posted by .

Explain why radioactivity can be used as a "clock" to measure the march of geologic time.

• science -

You can read all about "clocks in rocks" here.
http://www.sciencecourseware.com/virtualdating/files/1.0_ClocksInRocks.html

I shall be happy to critique your summary explanation.

• science -

While the moment in time at which a particular nucleus decays is unpredictable, a collection of atoms of a radioactive nuclide decays exponentially at a rate described by a parameter known as the half-life, usually given in units of years when discussing dating techniques. After one half-life has elapsed, one half of the atoms of the nuclide in question will have decayed into a "daughter" nuclide or decay product. The proportion of the original nuclide to its decay products changes in a predictable way as the original nuclide decays over time. This predictability allows the relative abundances of related nuclides to be used as a clock to measure the time from the incorporation of the original nuclides into a material to the present.

## Respond to this Question

 First Name School Subject Your Answer

## Similar Questions

1. ### Earth Science

What are the time divisions that are used for the geologic time scale and what determineshow they are divided?
2. ### science

how is relative dating used to evaluate geologic time.
3. ### earth, science

Which of the following statements describes the development of the geologic time scale?
4. ### Science

Which of the following gases was most likely present in Earth's earliest atmosphere?
5. ### math

On Friday morning two clocks are correctly set at 6 a.m. One clock gains 1 minute every 2 hours. The other clock loses 1 minute every hour. When the real time is 10 p.m. that evening, the fast clock is ______ minutes ahead of the slow …
6. ### math

On Friday morning two clocks are correctly set at 6 a.m. One clock gains 1 minute every 2 hours. The other clock loses 1 minute every hour. When the real time is 10 p.m. that evening, the fast clock is ______ minutes ahead of the slow …
7. ### math

A grandfather clock shows a time of 7 o’clock. What is the exact radian measure of the angle between the hour hand and the minute hand?
8. ### science

Locate and click on this section of the geologic time scale, and list the other possible names that could have been used to describe this era, and why?
9. ### Science

The geologic time scale originally ordered Earth's rocks by: A. absolute age B. relative age*** C. composition D. decades and centuries Where did scientists originally get their information to develop the geologic time scale?
10. ### Science Earth

Label the year and name of each geologic area on your geologic time scale. Using the 1 cm = 10 million years scale, figure out and measure each distance below from the PRESENT line. Pre-Cambrian Era = 4.6 Billion years ago = _______________________ …

More Similar Questions

Post a New Question