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# Geology Decay Curves and Carbon 14

The half life of an element is the time taken for half of the sample to decay to the new element.
It is possible to determine the number of half lives from the sample. Once the sample size is determined and
we know the half life of Carbon 14 is 5,730 years we can determine the rock’s age.

Carbon 14 Decay

Aim: To predict the age of a rock sample.
What you need to do:

1. A rock sample contains 512 units of Carbon 14. Complete the table by halving the mass for each

Questions

Questions
1. Determine from the graph the half life when 3 units of Carbon 14 are remaining in the sample.

2. Calculate the age of the sample from the number of half lives that the sample has decayed.

Conclusion
Write a conclusion, which explains in your own words how we can predict a rock's age from a decay curve.

Relative Dating Crossword

Putting age to rocks is not enough to gain a picture of Earth history. By using relative dating we can put events into a logical order of time.
Complete the following crossword on relative dating:

1. Sediments are usually found laid down h............................... layers at any time.
2. F............................. is an event, which can happen to rocks
3. Geological h...................shows us the order of events.
4. S.............................................. are horizontal rock layers with the oldest at the bottom.
5. 9. Igneous rock can i.......................... other rocks in a molten state during volcanic activity at anytime.
6. Unusual features are expected as these can appear as b.................................. in the rock layers.
7. 10. Rocks with the same or similar f................ were laid down at approximately the same time.
8. F.............................. is another event, which can happen to rocks at any time.