The purpose of this study is to examine the effects of blog activities on elementary students' environmental literacy in science class. The relationships between students' environmental literacy levels, their parents' interest in environmental activities and the frequency of outdoor activities they do have also been also examined. Pre-test post-test quasi-experimental design has been utilized. The participants of the study are 80 seventh-grade elementary school students. The data have been gathered through "Environmental Literacy Scale". After that, the instructor has created a blog to share some movies, animations and reflective questions for all the students. The students could follow and engage in all the sharing. The activities have lasted for eight weeks. Descriptive statistics, t-test and regression analysis have been tested via the data. The results have indicated that there is a significant difference between pre- and post-test scores regarding the students' "environmental knowledge", "attitude towards environment" and "being responsible for environment". Furthermore; positive but weak relationship has been detected between students' environmental literacy levels and parents' interests in environmental activities. On the other hand, there is a moderate, positive correlation between students' interest in environmental problems and involving in outdoor activities with parents (r = 0.423, p = 0.001). Overall, students' involvements in blog activities and doing outdoor activities with parents have been found to be effective in acquiring environmental literacy.