The Minnesota Department of Education uses the diagram below to describe the four content “strands” and “substrands” within each area of content. For each substrand, there are academic standards identifying the academic knowledge to be achieved.
“The standards … describe a connected body of science and engineering knowledge acquired through active participation in science experiences. These experiences include hands-on laboratory activities rooted in scientific inquiry and engineering design. The standards are placed at the grade level where mastery is expected with recognition that a progression of learning experiences in earlier grades builds the foundation for mastery later on.”
-- Minnesota Department of Education, Academic Standards Science K-12
For more details, view the Minnesota Department of Education Academic Standards Science K-12 curriculum page