Content-based language learning uses subject matter content to teach language skills unconsciously. The sample materials focus on photosynthesis, with readings, activities, and language exercises. The readings explain that photosynthesis is the process by which plants use sunlight, carbon dioxide, and water to produce glucose and oxygen. It is essential for producing food and sustaining life. Students practice repeated reading, identify vocabulary, complete concept maps, summarize the passages, and compare reading a printed text to an online one.