This image shows a completed worksheet titled "The Carbon Cycle," which includes answers to questions about how plants convert carbon dioxide into energy-rich compounds through photosynthesis, the formation of fossil fuels over millions of years, processes that release carbon dioxide into the atmosphere, major carbon dioxide reservoirs on Earth, forms of carbon in the oceans, the role of plants and animals in maintaining atmospheric carbon balance, and human activities that increase the greenhouse effect.

Worksheet 1 on The Carbon Cycle, featuring questions and answers about photosynthesis, fossil fuel formation, carbon dioxide release, carbon reservoirs, and the greenhouse effect.