Carbon Cycle

Carbon Cycle

The carbon cycle shows how carbon travels between the air, land, water, and living things. Plants take in carbon dioxide from the air during photosynthesis to make their food. Animals get carbon by eating plants, and they release carbon back into the air through respiration. When plants and animals die, decomposers break them down, returning carbon to the soil and air. Burning fossil fuels also adds carbon to the atmosphere. By studying the carbon cycle, scientists can better understand climate change and how to keep ecosystems healthy.

Science and Engineering Practices (SEP): Developing and Using Models

Scientists use models to understand how carbon moves through different parts of the environment. By developing and refining these models, they can predict how changes, such as deforestation or burning fossil fuels, impact carbon levels. These models help researchers address climate change, improve conservation efforts, and understand the effects of human activities on ecosystems.

Activity Ideas:

• Carbon Cycle Diagram – Draw a diagram illustrating how carbon moves through the atmosphere, plants, animals, soil, and oceans.
• Carbon Footprint Investigation – Track daily activities that release carbon, such as transportation and electricity use, and explore ways to reduce carbon emissions.

Crosscutting Concept (CCC): Cause and Effect

Recognizing cause-and-effect relationships in the carbon cycle helps scientists understand how certain actions or events affect the environment. For example, if more fossil fuels are burned, more carbon dioxide is released into the atmosphere, which can lead to global warming. If forests are cut down, less carbon is removed from the air through photosynthesis. These changes can upset the balance of ecosystems and affect the climate. By studying these effects, scientists can find ways to protect the planet and reduce harmful impacts.

• Cause: Increased burning of fossil fuels
  Effect: More carbon dioxide in the atmosphere, contributing to global warming.
• Cause: Deforestation reduces the number of trees absorbing carbon
  Effect: Less carbon is removed from the atmosphere, leading to an imbalance.
• Cause: Increased ocean absorption of carbon dioxide
  Effect: The water becomes more acidic, making it harder for sea creatures to survive.

Scientists can develop solutions to reduce carbon emissions, promote sustainable practices, and protect natural ecosystems by studying the carbon cycle.