<![CDATA[This study aims to determine the improvement of students' scientific literacy skills through the application of a guided inquiry learning model based on Socio-Scientific Issues (SSI) on the material of earth structure and its development. This study used a quantitative method with a pre-experimental design in the form of a one-group pretest-posttest design on 30 junior high school students. The research instrument was a scientific literacy essay test given before and after treatment. Data were analyzed using the Shapiro-Wilk normality test, paired sample t-test, and N-Gain test. The results showed an increase in students' scientific literacy skills after the implementation of guided inquiry learning based on SSI. The results of the paired sample t-test showed a significant value between the pretest and posttest results. The N-Gain analysis obtained an average of 0.59 with a moderate category. The indicator "researching, evaluating, and using scientific information for decision making and action" obtained the highest increase with a high category.]]>
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