1. Radioactive Dating What is Radioactive Decay?
What is Radioactive Dating?
How do Scientists Determine Earth’s Age?

2. 93.75%
6.25%

3. What is Radioactive Dating? DE 1:24
ANSWERS TO QUESTIONS
billion years
2. 22, 920 years

4. CARBON – 14 DATING CARBON-14 VIDEO
See animation for Radioactive Dating - DE

5. Sample: The rest of the rocks have melted or eroded over time.

6. How do Scientists
Determine Earth’s Age?

7. Radioactive Dating Quiz Take out paper and number 1 - 10
If the statement is true, write true. If the statement is false, change the underlined word or words to make the statement true.
  1. _____________ Some elements can decay over time.
  2. _____________ The rate of decay of any radioactive element changes frequently.
  3. _____________ Radioactive elements occur naturally in sedimentary
  rocks.
 4. _____________ Geologists use radioactive dating to determine the absolute ages of rocks.

8. Fill in the blank to complete each statement.
  5. _____________ All plants and animals contain carbon.   
6. An element that has broken down and released particles and energy is said to be _____________.
  _____________ is a method of determining the absolute ages of rocks.
8. _____________ is the time it takes for half of the radioactive atoms in an element to decay.
  9. During _____________, the atoms of one element break down to form atoms of another element.
10. Using radioactive dating and samples of Earth and _____________ rocks, scientists can determine Earth’s age.

9.   1. true
  2. never changes
  3. igneous
  4. true
  5. true
  6. radioactive
  7. Radioactive dating
  8. Half-life
  9. radioactive decay
10. moon