Implement this Lesson:
This unit is best for ecosystem units or environmental cycles units.
Learning Objective:
Students will describe the movement of carbon within the carbon cycle. Students will evaluate the relative timing of movement through various locations in the carbon cycle.
Texas Essential Knowledge and Skills (TEKS)
6.11(A) research and describe why resource management is important in reducing global energy poverty, malnutrition, and air and water pollution
6.11(B) explain how conservation, increased efficiency, and technology can help manage air, water, soil, and energy resources
6.12(A)* investigate how organisms and populations in an ecosystem depend on and may compete for biotic factors such as food and abiotic factors such as availability of light and water, range of temperatures, or soil composition
6.12(B) describe and give examples of predatory, competitive, and symbiotic relationships between organisms, including mutualism, parasitism, and commensalism
6.12(C) describe the hierarchical organization of organism, population, and community within an ecosystem
6.13(A) describe the historical development of cell theory and explain how organisms are composed of one or more cells, which come from pre‐existing cells and are the basic unit of structure and function
6.13(B) identify and compare the basic characteristics of organisms, including prokaryotic and eukaryotic, unicellular and multicellular, and autotrophic and heterotrophic 6.13(C) describe how variations within a population can be an advantage or disadvantage to the survival of a population as environments change
7.10(A)* describe the evidence that supports that Earth has changed over time, including fossil evidence, plate tectonics, and superposition 7.10(B)* describe how plate tectonics causes ocean basin formation, earthquakes, mountain building, and volcanic eruptions, including super volcanoes and hot spots
7.11(A)* analyze the beneficial and harmful influences of human activity on groundwater and surface water in a watershed
7.11(B)* describe human dependence and influence on ocean systems and explain how human activities impact these systems
7.12(A)* diagram the flow of energy within trophic levels and describe how the available energy decreases in successive trophic levels in energy pyramids
7.13(A)* identify and model the main functions of the systems of the human organism, including the circulatory, respiratory, skeletal, muscular, digestive, urinary, reproductive, integumentary, nervous, immune, and endocrine systems
7.13(C)* compare the results of asexual and sexual reproduction of plants and animals in relation to the diversity of offspring and the changes in the population over time
7.13(D)*describe and give examples of how natural and artificial selection change the occurrence of traits in a population over generations
7.14(A) describe the taxonomic system that categorizes organisms based on similarities and differences shared among groups
8.10(A) describe how energy from the Sun, hydrosphere, and atmosphere interact and influence weather
8.10(B) identify global patterns of atmospheric movement and how they influence local weather
8.10(C) describe the interactions between ocean currents and air masses that produce tropical cyclones, including typhoons and hurricanes
8.12(B) describe how primary and secondary ecological succession affect populations and species diversity after ecosystems are disrupted by natural events or human activity
8.12(C) describe how biodiversity contributes to the stability and sustainability of an ecosystem and the health of the organisms within the ecosystem
8.13(A) identify the function of the cell membrane, cell wall, nucleus, ribosomes, cytoplasm, mitochondria, chloroplasts, and vacuoles in plant or animal cells 8.13(C) describe how variations of traits within a population lead to structural, behavioral, and physiological adaptations that influence the likelihood of survival and reproductive success of a species over generations
8.13(B) describe the function of genes within chromosomes in determining inherited traits of offspring
The Carbon Cycle — Nature’s Recycling System
The carbon cycle is like Earth’s recycling program!
It moves carbon, a tiny element found in all living things, around the planet — through the air, water, soil, and living organisms.
Every breath you take, every plant you see, and even the ocean waves are part of this amazing cycle!
What Is Carbon?
Carbon is an element — a building block of life!
It’s found in:
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Plants and animals
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Oceans and lakes
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Rocks and soil
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The air (as carbon dioxide — CO₂)
Everything that’s alive (including you!) contains carbon.
How the Carbon Cycle Works
Carbon travels in a big loop around the Earth through several steps. Let’s follow its journey!
1. Carbon in the Air
Carbon dioxide (CO₂) is a gas in the atmosphere.
It floats around in the air and is used by plants to grow.
2. Photosynthesis — Plants Take In Carbon
Plants use sunlight to take in CO₂ from the air and make food through photosynthesis.
They turn carbon into leaves, stems, and roots — storing it in their bodies!
Example: A marsh grass along the Texas coast soaks up CO₂ and grows taller!
3. Animals Eat Plants
When animals eat plants, the carbon moves into their bodies too.
That means the carbon from the air is now part of the animal!
Example: A fish eats seagrass → the fish now has that carbon inside it!
4. Respiration — Carbon Returns to the Air
Plants and animals breathe out CO₂ when they use energy.
This carbon goes back into the atmosphere — continuing the cycle!
5. Decomposition — When Living Things Die
When plants and animals die, decomposers (like bacteria, worms, and fungi) break them down.
This releases carbon back into the soil and air — helping new plants grow.
6. Long-Term Storage — Fossil Fuels and Rocks
Sometimes carbon gets trapped for millions of years in rocks or underground as fossil fuels (like oil, coal, and gas).
When people burn these fuels, the carbon is released back into the atmosphere as CO₂.
That adds extra carbon to the air and can affect Earth’s climate.
7. The Ocean’s Role
The oceans are huge carbon sponges!
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They absorb CO₂ from the air.
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Tiny ocean plants called phytoplankton use carbon for photosynthesis.
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Some carbon sinks to the deep sea and gets stored for a very long time.
Even seashells and corals are made from carbon (in the form of calcium carbonate)!
Why the Carbon Cycle Is Important
Supports life- All living things needs carbon to grow and survive
Balance the air- Keeps the right amount of carbon dioxide for plants and climate
Protects the ocean – Oceans help absorb extra carbon from the atmosphere
Climate control- Too much carbon dioxide traps heat and causes global warming
How We Can Help Keep the Cycle Balanced
Plant trees- trees absorb carbon dioxide
Use less gas – Reduces CO₂ from cars and machines
Save energy- Less burning of fossil fuels
Recycle and reuse- Keeps carbon-based materials in use longer
Fun Facts!
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You breathe out about 2 pounds of carbon dioxide every day!
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The ocean holds 50 times more carbon than the atmosphere!
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Fossil fuels were once ancient plants and plankton from millions of years ago.
The carbon cycle is nature’s way of recycling life’s building blocks — keeping Earth healthy, balanced, and full of life!
Possible Books:
- CO2 and the Ocean Blue
- The Charcoal Forest
- The Leaf Detective
Materials Needed:
- 7 Dice
- 7 Station Signs
- 7 Station Movement Directions
- Data record sheets for each student
Lesson Plan:
Engage:
- Review what carbon is (an element, the stuff of life)
- Discuss where carbon can be found on Earth
- Discuss the role of carbon in each of the places identified
Explore:
- Tell students that they are going to be carbon atoms moving through the carbon cycle.
- Categorize the places carbon can be found into these stations: Atmosphere, Plants, Animals, Soil, Ocean, Deep Ocean, and Fossil Fuels.
- Point out the areas of the room that are labeled with each station and contain the directions for movement from that station.
- Assign students to each station randomly and evenly.
- Have students identify the different places carbon could go from that given station. Discuss the processes that allow for the transfer of carbon between stations.
- Students should make a line and roll the die individually to follow the directions for movement from (or retention at) each station. Remind them that they are representing atoms of carbon moving through the carbon cycle and that they should record their movements on the data sheet.
- Students will realize the routine movements (or non-movements) in the carbon cycle.
Explain:
- Explain the student findings
Elaborate:
- Once the carbon atoms (students) have had a chance to roll the die ten times, have each student create a bar graph using the data they collected. The bar graph should represent the number of times the carbon atom (student) was at each station.
- Using graph paper, create a large bar graph recording the number of carbon atoms (students) at each station.
Evaluate:
- Grade participation and graphs