I apologize, but I couldn't find sufficient information to create detailed course entries for the Slovakia 5th Grade Curriculum - Natural Sciences. While some sources mention natural sciences as part of the curriculum for this grade level, they lack the specific details needed to create comprehensive entries. I did find that 5th grade in Slovakia includes biology, physics, and chemistry within natural sciences, and students can choose these as non-compulsory subjects for a total of 4 classes each. Additionally, environmental education is integrated into the Natural Sciences curriculum.