From the Ohio Department of Education website:
Academic content standards are clearly defined statements and/or illustrations of what all students, teachers, schools and school districts are expected to know and be able to do.
What are content standards?
Content standards describe the knowledge and skills that students should attain, often called the "what" of "what students should know and be able to do." They indicate the ways of thinking, working, communicating, reasoning and investigating, and important and enduring ideas, concepts, issues, dilemmas and knowledge essential to the discipline.
What are benchmarks?
Benchmarks are the specific components of the knowledge or skill identified by an academic content, performance or operational standard. It can be characterized as being declarative, procedural or contextual in the type of knowledge it describes. Attainment is communicated through through performance task (the construction of a response) and performance level (the defined score point on a formal assessment).
What are grade-level indicators?
Grade-level indicators are what students should know and be able to do. The indicators are the checkpoints that monitor progress toward the benchmarks.
To view the complete set of standards, pre-kindergarten through grade 12, visit the Ohio Department of Education website.