Absolute Dating

Question 1

A scientist is studying a radioactive element that has a half-life of 63 years. Choose the correct answers from the drop-down menus to complete each statement about the element. It will take years for half of the sample to decay. In 189 years, of the sample will be left. Scientists can figure out how old a sample is by multiplying the by the length of the half-life.

Revolt · Accepted Answer

63; Selection 1: 63; Selection 2: one-eighth; Selection 3: number of half-life cycles

Question 2

2.6 billion years3.9 billion years✔ 5.2 billion years

Revolt · Accepted Answer

5.2 billion years

Question 3

Use the drop-down menus to select the correct answers to complete the paragraph.

Revolt · Accepted Answer

✔ atoms; The building blocks of matter are called . A substance made up of the same kind of atoms is called a(n) . elements lose particles. This makes them .: atoms; The building blocks of matter are called . A substance made up of the same kind of atoms is called a(n) . elements lose particles. This makes them .: element; The building blocks of matter are called . A substance made up of the same kind of atoms is called a(n) . elements lose particles. This makes them .: Unstable; The building blocks of matter are called . A substance made up of the same kind of atoms is called a(n) . elements lose particles. This makes them .: radioactive

Question 4

Use the drop-down menus to complete the paragraph.

Revolt · Accepted Answer

✔ igneous; Geologists determine absolute age by comparing the amounts of radioactive and nonradioactive elements in rock. The radioactive, or , elements decay into nonradioactive elements. Because this rate of d: igneous; Geologists determine absolute age by comparing the amounts of radioactive and nonradioactive elements in rock. The radioactive, or , elements decay into nonradioactive elements. Because this rate of d: unstable; Geologists determine absolute age by comparing the amounts of radioactive and nonradioactive elements in rock. The radioactive, or , elements decay into nonradioactive elements. Because this rate of d: constant; Geologists determine absolute age by comparing the amounts of radioactive and nonradioactive elements in rock. The radioactive, or , elements decay into nonradioactive elements. Because this rate of d: stable

Question 5

2.6 billion years✔ 3.9 billion years5.2 billion years

Revolt · Accepted Answer

3.9 billion years

Question 6

Which statements describe the image? Check all that apply.

Revolt · Accepted Answer

The process works only with organic matter.; The element has a half-life of 5,730 years.

Question 7

Which object would a geologist date using carbon-14 dating?

Revolt · Accepted Answer

a woolly mammoth fossil that existed 15,000 years ago

Question 8

How would a geologist use absolute dating to determine the age of sedimentary layers?

Revolt · Accepted Answer

by dating the age of intrusions and extrusions near a sedimentary rock layer

Question 9

✔ 2.6 billion years3.9 billion years5.2 billion years

Revolt · Accepted Answer

2.6 billion years

Question 10

Which statements about radioactive decay are true? Check all that apply.Most elements are unstable.Radioactive decay happens when one kind of atom becomes another kind.Radioactive elements occur in nature.All elements have the same rate of decay.Carbon-14 decays into nitrogen-14.

Revolt · Accepted Answer

Radioactive decay happens when one kind of atom becomes another kind.; Radioactive elements occur in nature.; Carbon-14 decays into nitrogen-14.

Absolute Dating Answers

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