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100+ Free OSAT Earth Science (OK108) Practice Questions

Pass your Oklahoma Subject Area Test (OSAT) Earth Science (OK108) exam on the first try — instant access, no signup required.

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Key Facts: OSAT Earth Science (OK108) Exam

OK108

Official CEOE test code for OSAT Earth Science

CEOE Tests Page

80 + 1

80 selected-response questions and 1 constructed-response assignment

CEOE Earth Science (108) Test Page

4 hours

Official testing time, excluding the 15-minute tutorial and NDA period

CEOE Earth Science (108) Test Page

240

Official passing score

CEOE Earth Science (108) Test Page

$118

Official OK108 test fee

CEOE Earth Science (108) Test Page

16/18/18/18/15/15

Official percentage weighting across the six OK108 subareas

CEOE Study Guide - Field 108 Test Design and Framework

Official CEOE/Pearson materials list OSAT Earth Science as Field 108 / OK108. The test has 80 selected-response questions and one constructed-response assignment, with 4 hours of testing time plus a 15-minute tutorial and nondisclosure-agreement period. The passing score is 240 and the public OK108 test fee is $118. Content is weighted 16% science practices and engineering, 18% space systems, 18% geological systems, 18% atmospheric and hydrological systems, 15% natural hazards and human environmental interaction, and 15% pedagogical content knowledge.

Sample OSAT Earth Science (OK108) Practice Questions

Try these sample questions to test your OSAT Earth Science (OK108) exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A teacher wants students to test whether darker soil warms faster than lighter soil under the same lamp. Which change would make the investigation a controlled experiment?
A.Use the same mass of each soil type and place both samples the same distance from the lamp
B.Use a different thermometer for each sample and record only the final temperature
C.Heat the darker soil indoors and the lighter soil outdoors
D.Add water to the darker soil because darker soils are often more moist
Explanation: A controlled experiment changes one independent variable while holding other important conditions constant. Keeping soil mass, lamp distance, container type, and measurement time the same helps isolate soil color as the tested variable.
2In an investigation of stream erosion, which variable is the dependent variable?
A.The slope of the stream table
B.The amount of water released per minute
C.The mass of sediment transported during each trial
D.The type of sediment placed in the channel
Explanation: The dependent variable is the measured outcome that responds to changes in the independent variable. In a stream erosion investigation, sediment transported is an outcome that can be compared across different slopes, flow rates, or sediment types.
3Which field safety practice is most appropriate before students collect rock samples from a road cut?
A.Allow students to climb the exposure wherever fresh rock is visible
B.Review site hazards, require eye protection, and keep students away from unstable slopes and traffic
C.Tell students to collect the largest sample possible for easier identification
D.Have students work alone so each student gets independent data
Explanation: Earth science field work requires hazard identification and risk reduction before data collection begins. Unstable slopes, falling fragments, tools, and nearby traffic are predictable hazards at a road cut, so supervision, protective equipment, and boundaries are essential.
4A topographic map shows contour lines that are very close together on one side of a valley. What does that pattern indicate?
A.A steep slope
B.A flat plain
C.A stream flowing uphill
D.A change from igneous to sedimentary rock
Explanation: Closely spaced contour lines represent rapid elevation change over a short horizontal distance, which means a steep slope. Widely spaced contours indicate gentler slopes.
5Which statement best distinguishes a scientific claim from a scientific hypothesis?
A.A claim is supported by evidence and reasoning; a hypothesis is a testable tentative explanation or prediction
B.A claim must always be true; a hypothesis is always false until proven
C.A claim is used only in engineering; a hypothesis is used only in astronomy
D.A claim requires no evidence; a hypothesis requires no investigation
Explanation: Scientific arguments use claims that should be backed by evidence and reasoning. A hypothesis is a tentative, testable explanation or prediction that can guide data collection.
6Students compare four maps of the same watershed: topographic, geologic, soil, and land-use maps. Which question is best answered by the geologic map?
A.Where are the steepest slopes in the watershed?
B.Which bedrock units crop out near the stream channel?
C.Which fields are currently planted in crops?
D.Which roads cross the watershed boundary?
Explanation: A geologic map shows the distribution of rock units and geologic structures at or near Earth's surface. It is the best choice for identifying bedrock units along a stream channel.
7A graph shows atmospheric carbon dioxide and global mean temperature both increasing over several decades. What additional evidence is needed before concluding that one caused the other?
A.A larger printed version of the same graph
B.A mechanism linking greenhouse gas absorption to energy balance plus evaluation of other climate forcings
C.A statement that two variables with similar trends are always causally linked
D.Removal of all data points that do not fit a straight line
Explanation: Correlation alone is not enough to establish causation. A causal explanation needs a physical mechanism, supporting evidence, and consideration of alternative factors such as solar variability, aerosols, volcanic activity, and land-use changes.
8Which model would be most useful for predicting how a contaminant plume may move through an aquifer?
A.A scale model of the solar system
B.A groundwater flow model using hydraulic gradient, permeability, and porosity data
C.A rock cycle poster showing igneous, sedimentary, and metamorphic paths
D.A classification key for cloud types
Explanation: Groundwater movement depends on hydraulic gradient and the properties of the porous medium. A groundwater flow model can use those variables to predict direction, rate, and spread of a contaminant plume.
9An engineering team is evaluating two levee designs for a flood-prone town. Which factor is a constraint rather than a criterion?
A.The design must reduce expected flood depth in the downtown district
B.The project budget cannot exceed the amount approved by the city
C.The finished levee should be durable during repeated high-flow events
D.The design should minimize disruption to nearby wetlands
Explanation: Constraints are limits a solution must work within, such as cost, materials, time, laws, or site restrictions. Criteria are desired performance features used to judge how well the design solves the problem.
10Which data display is most appropriate for showing how stream discharge changes during a storm over several hours?
A.A line graph of discharge versus time
B.A pie chart of rock types in the watershed
C.A bar chart listing the names of nearby towns
D.A geologic cross section with no time scale
Explanation: A line graph is well suited for continuous data collected through time. Storm hydrographs use this format to show rising limb, peak discharge, and recession after rainfall.

About the OSAT Earth Science (OK108) Exam

The OSAT Earth Science (OK108) is the Oklahoma Subject Area Test for Earth Science teacher certification. The official CEOE test page lists a computer-based test with 80 selected-response questions, one constructed-response assignment, four hours of testing time, a 240 passing score, and a $118 fee. The official framework covers science practices and engineering, space systems, geological systems, atmospheric and hydrological systems, natural hazards and human environmental interaction, and pedagogical content knowledge.

Assessment

80 selected-response questions and 1 constructed-response assignment; CEOE general OSAT information lists these exams as approximately 85% selected response and 15% constructed response.

Time Limit

4 hours testing time; 4 hours and 15 minutes total appointment time including tutorial and nondisclosure agreement

Passing Score

240 scaled score

Exam Fee

$118 (Certification Examinations for Oklahoma Educators (CEOE) / Office of Educational Quality and Accountability (OEQA), administered by Pearson Evaluation Systems)

OSAT Earth Science (OK108) Exam Content Outline

16%

Science Practices and the Engineering Process

Scientific investigations, dependent and independent variables, safety, data collection, tables and graphs, maps and diagrams, claims, evidence, reasoning, engineering criteria and constraints, systems, matter, energy, and model limitations.

18%

Space Systems

Origin and structure of the universe, galaxies, stellar characteristics and life cycles, nuclear fusion, spectroscopy, solar system formation, planetary characteristics, Kepler's and Newton's laws, and the Earth-Moon-Sun system.

18%

Geological Systems

Earth history, geologic time, fossil evidence, stratigraphy, relative and radiometric dating, plate tectonics, Earth's layered interior, seismic waves, rocks, minerals, weathering, erosion, and topographic features.

18%

Atmospheric and Hydrological Systems

Atmospheric structure, solar radiation, energy transfer, albedo, global wind patterns, water phase changes, latent heat, cloud and precipitation formation, weather and climate, instruments, forecasting, groundwater, freshwater, coastlines, oceans, and circulation.

15%

Natural Hazards and Human Environmental Interaction

Biogeochemical cycles, natural hazards and their impacts, climate change, hazard monitoring and mitigation, energy and natural resources, human impacts on atmosphere, hydrosphere, lithosphere, and biosphere, and environmental monitoring and remediation.

15%

Pedagogical Content Knowledge

Standards-based Earth science learning goals, analysis of student work or assessment data, identifying student strengths and needs, instructional interventions, evidence-based feedback, and using assessment analysis to inform future instruction.

How to Pass the OSAT Earth Science (OK108) Exam

What You Need to Know

  • Passing score: 240 scaled score
  • Assessment: 80 selected-response questions and 1 constructed-response assignment; CEOE general OSAT information lists these exams as approximately 85% selected response and 15% constructed response.
  • Time limit: 4 hours testing time; 4 hours and 15 minutes total appointment time including tutorial and nondisclosure agreement
  • Exam fee: $118

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

OSAT Earth Science (OK108) Study Tips from Top Performers

1Use the official OK108 framework as the checklist for study topics; do not study Earth science as a generic survey only.
2Practice interpreting Earth science representations, including topographic maps, geologic maps, H-R diagrams, weather maps, hydrographs, and stratigraphic sections.
3For constructed-response practice, cite specific evidence from student work, identify one meaningful strength and one need, and connect the intervention to Earth science content.
4Review common misconceptions: seasons are caused by axial tilt, groundwater commonly moves through pore spaces and fractures, and correlation alone does not prove causation.
5Mix content areas during review so you can shift between space, geology, atmosphere, hydrology, hazards, and pedagogy under timed conditions.

Frequently Asked Questions

What is the OSAT Earth Science test code?

The official CEOE tests page lists Earth Science as OK108, and the test page labels the field as Earth Science (108).

How many questions are on OSAT Earth Science (OK108)?

The official OK108 test page lists 80 selected-response questions and 1 constructed-response assignment. CEOE notes that tests may include questions being evaluated for future administrations that do not affect a candidate's score.

How long is the OSAT Earth Science test?

The official OK108 page lists 4 hours of testing time and a 4-hour-and-15-minute total appointment that includes 15 minutes for the CBT tutorial and nondisclosure agreement.

What score do I need to pass OK108?

The official OK108 test page lists a passing score of 240.

How much does OSAT Earth Science cost?

The official OK108 test page lists the test fee as $118. Payment policies are provided on the CEOE payment information page.

Does CEOE publish an OK108 pass rate?

A current public pass rate for OK108 was not reported on the official CEOE/Pearson test, study guide, preparation, or payment pages reviewed.