The purpose of this research was to describe the influence of roundhouse diagram learning strategy through CIRC type of cooperative learning model on biogeochemical cycle material. The research design that used was pre-experimental design. The research subjects were X grade of natural sciences students that consist of 2 classes, as the control and experiment class. The method that used were test method (pre-test and post-test) and t-test. The result showed that pre-test average score for each control and experiment class was 36.2 and 34; post-test average score for each control and experiment class was 63.5 and 85.3; the percentage of gain normality control class for each category of low, medium, and high were 53.3%; 46.7%; and 0%; the percentage of gain normality experiment class for each category of low, medium, and high were 16.7%; 73.3%; and 10.0%; the result of t-test showed that Sig (2 tailed) value or p value 0,000 that < 0.05, so the difference between control and experiment class was statistically significant at 0.05 probability. Based on it, can be concluded that the implementation of roundhouse diagram learning strategy through CIRC type of cooperative learning model give influence to improve the student learning outcomes of biogeochemical cycle material.
Key word: roundhouse diagram, CIRC type of cooperative model, biogeochemical cycle