OSAT Earth Science (OK108) case studies

The OSAT Earth Science (OK108) is a subject-area certification assessment used in Oklahoma's teacher certification process for candidates who intend to teach Earth science at the secondary level. It is designed for people who already hold or are completing an educator preparation program and need to demonstrate content knowledge in the geosciences before entering or advancing in the classroom. The test samples broadly across the discipline: scientific inquiry and Earth science practices, astronomy and the Earth–Moon–Sun system, minerals and rocks, plate tectonics and Earth's interior, surface processes and soils, Earth history and stratigraphy, atmosphere and climate, oceans and the cryosphere, and the instructional and safety considerations of running a lab. Expect both selected-response items and at least one constructed response, so preparation should combine content review with practice writing short, evidence-based explanations. The OSAT Earth Science (OK108) case studies are 5 cases and about 2,760 words.