Question:

The discovery of radioactivity was a boost to Earth scientists who were then able to know more about>?

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a. ages of various rocks

b. why the Earth's interior is hot

c. both

d. neither

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  1. c


  2. c.

    Scientists use the half-life of radioisotopes to determine the age of rocks.

    http://www.newcastle-schools.org.uk/nsn/...

    Radioactive potassium, uranium and thorium are thought to be the three main sources of heat in the Earth's interior.

    http://www.sciencedaily.com/releases/200...

  3. c.
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