The secondary school third year “Human and Environment” unit was selected as the topic. This unit includes ecosystems, biological variety and environmental problems sub-topics. The introduction part of the material consists of animations to attract student interest. Following the introduction, students are motivated towards the lesson. The teaching material is composed of lecture and assessment sections. The lecture section includes written and visual formats prepared according to the dual coding theory. Visuals are used to ensure better comprehension of the topic (Fig. 1).