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FCAT Grade 8 Science Assessment Practice Questions

Category - FCAT Science Assessment Grade 8

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Radiodating is the use of radioactive elements to roughly determine the age of a layer of sediment. The amount of radioactive element remaining is compared to its ‘daughter element’, the element that it becomes after radioactivity ceases. Which of the following pairs of radioactive: daughter elements is correctly paired?

Thorium à Radium
Uranium à Lead
Potassium à Helium
Francium à Argon
Rubidium à Lead

Explanation

Answer: B - After Uranium completes its radioactive life cycle, it becomes lead. Uranium-238 has a half-life of 4.47 billion years, making the comparison of lead product and remaining uranium ideal for long time frame geologic studies.

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FCAT Grade 8 Science Assessment Practice Questions

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FCAT Grade 8 Science Assessment Practice Questions

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