Implementing inquiry learning model to improve primary school students’ critical thinking on earth and universe concept

21st century skills are a very important skill and must be possessed by students, one of them is critical thinking skills. This study aims to improve primary students' critical thinking by implementation inquiry learning model. Instrument test in this study was 10 question and essay format, and it was adapted by Ennis critical thinking framework. Method this study is quasi experiment. This research was conducted by 54 subjects of primary school students in Pekanbaru. The results of this research obtained students' seen from the value of the gain index after implemented inquiry learning model was in medium category. It could be concluded that the inquiry learning model can improve primary students' critical thinking skills on Earth and universe concept.