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Earth's History Practice Tests

These Grade 8 Science practice tests cover geologic time, fossils, relative and radiometric dating, rock layers, unconformities, plate tectonics, seafloor spreading, past climates, mass extinctions, scientific models, and evidence used to reconstruct Earth's history.

Skills covered

  • Interpreting fossils, sedimentary layers, and the geologic time scale
  • Using relative dating and radioactive decay evidence
  • Explaining plate boundaries, seafloor spreading, and changing continents
  • Inferring past environments and climate from geological evidence
  • Evaluating models, uncertainty, and multiple lines of evidence

How to use these practice tests

Start by identifying the evidence described, such as a fossil, rock layer, map, or measurement. Then determine what the evidence can show about relative order, past conditions, geological processes, or the timing of an event.

For more Grade 8 Science practice, return to the Grade 8 Science category.

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Grade 8 Earths History Practice Tests

Practice Grade 8 Science questions about geologic time, fossils, rock layers, plate tectonics, Earth changes, and evidence of Earths history.

Choose the best answer. Use rock layers, fossils, geological processes, and scientific evidence to interpret events in Earth history.

10 Questions
0/10 Questions0 %
Correct 0
Incorrect 0
Unanswered 10
1. QuestionMultiple choice

What is the purpose of a scientific model of Earth history?

Please select an answer first.

Correct answer: A

The correct answer is To represent complex processes and make explanations or predictions easier to test.

  1. Identify the evidence: Determine whether the question uses fossils, rocks, layers, geological time, or a model of Earth history.
  2. Connect the evidence to time: Models simplify systems so scientists can organize evidence, explain patterns, and test ideas.
  3. Check the conclusion: The correct choice is To represent complex processes and make explanations or predictions easier to test.

Models simplify systems so scientists can organize evidence, explain patterns, and test ideas.

2. QuestionMultiple choice

Why are multiple lines of evidence important when studying ancient Earth?

Please select an answer first.

Correct answer: B

The correct answer is Different evidence can support the same explanation and make the conclusion stronger..

  1. Identify the evidence: Determine whether the question uses fossils, rocks, layers, geological time, or a model of Earth history.
  2. Connect the evidence to time: Agreement among fossils, rock layers, dates, and other evidence increases confidence in a scientific interpretation.
  3. Check the conclusion: The correct choice is Different evidence can support the same explanation and make the conclusion stronger..

Agreement among fossils, rock layers, dates, and other evidence increases confidence in a scientific interpretation.

3. QuestionMultiple choice

A rock layer contains a fossil found in several distant locations. What can this pattern help scientists do?

Please select an answer first.

Correct answer: C

The correct answer is Correlate rock layers that formed during a similar time interval.

  1. Identify the evidence: Determine whether the question uses fossils, rocks, layers, geological time, or a model of Earth history.
  2. Connect the evidence to time: A widespread fossil can help match layers across regions when it represents a limited time interval.
  3. Check the conclusion: The correct choice is Correlate rock layers that formed during a similar time interval.

A widespread fossil can help match layers across regions when it represents a limited time interval.

4. QuestionMultiple choice

Why are diagrams of geologic time often drawn with unequal-sized intervals?

Please select an answer first.

Correct answer: D

The correct answer is The intervals represent different lengths of time..

  1. Identify the evidence: Determine whether the question uses fossils, rocks, layers, geological time, or a model of Earth history.
  2. Connect the evidence to time: Geologic eras and periods can have very different durations, so a time-scaled diagram may show unequal widths.
  3. Check the conclusion: The correct choice is The intervals represent different lengths of time..

Geologic eras and periods can have very different durations, so a time-scaled diagram may show unequal widths.

5. QuestionMultiple choice

What can a geological cross section show?

Please select an answer first.

Correct answer: A

The correct answer is The order and relationships of rock layers below the surface.

  1. Identify the evidence: Determine whether the question uses fossils, rocks, layers, geological time, or a model of Earth history.
  2. Connect the evidence to time: A cross section represents subsurface layers, faults, folds, and other relationships that may not be visible from above.
  3. Check the conclusion: The correct choice is The order and relationships of rock layers below the surface.

A cross section represents subsurface layers, faults, folds, and other relationships that may not be visible from above.

6. QuestionMultiple choice

Why should scientists include uncertainty when reporting an estimated rock age?

Please select an answer first.

Correct answer: B

The correct answer is Measurements and assumptions have limits that can affect the estimate..

  1. Identify the evidence: Determine whether the question uses fossils, rocks, layers, geological time, or a model of Earth history.
  2. Connect the evidence to time: Scientific measurements have ranges and possible sources of error, so reporting uncertainty makes the conclusion more accurate.
  3. Check the conclusion: The correct choice is Measurements and assumptions have limits that can affect the estimate..

Scientific measurements have ranges and possible sources of error, so reporting uncertainty makes the conclusion more accurate.

7. QuestionMultiple choice

Why can repeated measurements improve a geological investigation?

Please select an answer first.

Correct answer: C

The correct answer is They help identify consistent patterns and reduce the effect of random variation..

  1. Identify the evidence: Determine whether the question uses fossils, rocks, layers, geological time, or a model of Earth history.
  2. Connect the evidence to time: Repeated measurements provide more data for evaluating whether an observed pattern is reliable.
  3. Check the conclusion: The correct choice is They help identify consistent patterns and reduce the effect of random variation..

Repeated measurements provide more data for evaluating whether an observed pattern is reliable.

8. QuestionMultiple choice

What is a hypothesis in an investigation of Earth history?

Please select an answer first.

Correct answer: D

The correct answer is A testable explanation based on available evidence.

  1. Identify the evidence: Determine whether the question uses fossils, rocks, layers, geological time, or a model of Earth history.
  2. Connect the evidence to time: A hypothesis proposes an explanation that can be compared with observations or additional evidence.
  3. Check the conclusion: The correct choice is A testable explanation based on available evidence.

A hypothesis proposes an explanation that can be compared with observations or additional evidence.

9. QuestionMultiple choice

What can a map showing matching rock types on separate continents support?

Please select an answer first.

Correct answer: A

The correct answer is The continents may once have been connected or located differently..

  1. Identify the evidence: Determine whether the question uses fossils, rocks, layers, geological time, or a model of Earth history.
  2. Connect the evidence to time: Matching rock formations across now-separated continents can support the idea that the landmasses were once joined.
  3. Check the conclusion: The correct choice is The continents may once have been connected or located differently..

Matching rock formations across now-separated continents can support the idea that the landmasses were once joined.

10. QuestionMultiple choice

Which conclusion is best supported by several matching fossils, rock layers, and magnetic patterns?

Please select an answer first.

Correct answer: B

The correct answer is The continents and ocean basins have changed position through plate movement..

  1. Identify the evidence: Determine whether the question uses fossils, rocks, layers, geological time, or a model of Earth history.
  2. Connect the evidence to time: Independent evidence from fossils, rocks, and magnetism can combine to support plate movement and changing geography.
  3. Check the conclusion: The correct choice is The continents and ocean basins have changed position through plate movement..

Independent evidence from fossils, rocks, and magnetism can combine to support plate movement and changing geography.

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