OSAT Earth Science (108) Study Guide 2027–2028 | Oklahoma Earth Science Teacher Certification Exam Prep, 200 Questions (PDF)

Prepare for the Oklahoma Subject Area Test (OSAT) in Earth Science, test code 108. Every section follows the official framework, both practice tests are weighted like the real selected-response subareas, and the constructed-response assignment is taught step by step.

What's Inside

• Exam overview: 80 selected-response questions plus one constructed-response assignment, the 4-hour testing session, the 240 passing score on the 100-300 scale, the no-calculator rule, score reports, retakes and fees

• Science Practices and the Engineering Process: investigation design, lab and field safety, data and graphs, topographic and geologic maps, claims and evidence, engineering design and the crosscutting concepts

• Space Systems: the big bang, galaxies, dark matter, telescopes and spectra, the H-R diagram and star life cycles, the solar system, Kepler's and Newton's laws, seasons, moon phases, tides, eclipses and the sun

• Geological Systems: Earth and life history, fossils, relative and radiometric dating, Earth's interior, plate tectonics, minerals, rocks, weathering, erosion and landforms

• Atmospheric and Hydrological Systems: atmospheric structure and radiation, global winds, humidity, stability, clouds and precipitation, weather, forecasting and climate, streams, groundwater and the oceans

• Natural Hazards and Human Environmental Interaction: geochemical cycles, earthquakes, volcanoes, severe weather, climate change, energy and mineral resources, human impacts, monitoring and mitigation

• The constructed-response assignment: what scorers look for, a planning routine, two illustrative prompts and model response excerpts

• Charts, diagrams and 160+ quick-reference tables, plus Oklahoma Connections, Myth Checks, worked hand calculations and Quick Checks in every section

• Study schedules, FAQs and test-taking strategies

• 2 practice tests of 100 questions each, 200 questions total, with a complete answer key and an explanation for every question

Format

• Instant digital download (PDF), 8.5 × 11 in

• Clickable table of contents

• Print it or study on a tablet, laptop or phone

Please note: This is a digital product. No physical item will be shipped.

This is an independent study resource and is not affiliated with or endorsed by the Oklahoma Commission for Educational Quality and Accountability, CEOE, or Pearson.