Students can use concept maps to show the organization of their knowledge. They are helpful as evaluations as well as learning tools, particularly formative evaluations.
Igneous and rocks are two ideas, or nodes. The direction of the arrow instructs the reader how to read the statement. For example, rocks and igneous are related, but minerals and metamorphic are not (although a more advanced student may connect them with the appropriate label). Thus, "rocks can be igneous" should be understood as the assertion relating rocks and igneous. The nodes can be connected by more than one arrow. For instance, the two arrows between the terms "rocks" and "minerals" can be understood as the propositions "rocks are typically made of minerals" and "minerals combine to make rocks."
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