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Scientific reasoning and argumentative abilities are one of the purposes of science educations. The way to involve students in reasoning and arguing activities is to provide a science learning activities that integrates the practice of inquiry using scientific methods in Socio-Scientific Issue (SSI). To create this environment, one of the learning models that can be used is the Levels of Inqury (LOI) model. The LOI model is expected to give students- opportunity to collect and analyze scientific data to obtain evidence that supports their claims regarding SSI. The stages of LOI used in this study are discovery learning, interactive demonstration, and inquiry lesson. The purpose of this study was to know the changes in scientific reasoning and argumentative abilities of junior high school students after the implementation of the LOI model based on SSI in the science learning at global warming material. The method used is the weak experiment with the one group pretest-posttest design. The instrument used is a scientific reasoning test and scientific argumentation test. This study resulted in a gain of 33% for changes in students reasoning abilities and 39% for changes in students argumentative abilities.