Chapter 6 Lesson 3 Radioactive Dating

Most elements do not change.

• True

• False

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Some elements can decay over time.

• True

• False

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The rate of decay of any radioactive element changes frequently.

• True

• False

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Geologists use radioactive dating to determine the absolute ages of rocks.

• True

• False

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All plants and animals contain carbon.

• True

• False

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An element that has broken down and released particles and energy is said to be

• sedimentary

• igneous

• radioactive

• a new rock

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_______________________ is a method of determining the absolute ages of rocks.

• Relative dating

• Rock layering

• Radioactive dating

• Radioactive decay

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The time it takes for half of the radioactive atoms in an element to decay is the ______________

• absolute age

• half-time

• half-life

• radioactive age

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During ___________________, the atoms of one element break down to form atoms of another element.

• radioactive dating

• rock formation

• radioactive decay

• erosion

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If there is only 50% of the radioactive element left in a sample, how many half-lives have gone by?

• 1

• 2

• 3

• 4

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NGSS.HS-PS1-8