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Carbon cycle

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Why this lesson, and why the 3D

Carbon cycle is a fifteen-minute projector lesson, not a homework packet and not a film with a quiz bolted on. Put this hook on the board before you dim the lights: Fast stores and slow stores. The fossil-fuel tap is a human transfer from slow to fast. By the end of the slot a pupil should be able to name stores, watch arrows, and open a fossil-fuel tap as a transfer from a slow geologic store into the fast cycle. Curriculum tags in the header (GCSE; A-level carbon; APES 1.4 / 4.6) are filters, not a flag. The room is worldwide; SI first; International English. Ages on the card (GCSE, A-level, NGSS MS, APES) are a suggested band, not a gate.

A-level water and carbon is one pair of diagrams: stores, fluxes, a budget. Thames-side power and heating are a fossil tap on the slow store; a US Dust Bowl land-use story is carbon in soil and vegetation, still the same boxes. The atmosphere store is the small, fast box that people breathe and plants use; rock and fossil are huge and slow. Opening the tap grows the air box and shrinks the slow box. That is why a school carbon diagram and a NOAA flask record are the same machine at different honesty. Do not preach a policy. Stay on the physical transfer. The ocean talks to the air both ways. Weathering is slow. Photosynthesis and respiration are fast. A UK GCSE class that thinks burning creates new carbon atoms will misread every later climate sentence. The atoms were already in the rock.

The 3D is a named, inspectable object. Click the part, not a caption. If the model will not spin, the Why panel still carries the mechanism, the two photographs, and the film. Do not apologise for the model. Drive it. A silent spin teaches a screensaver. A named mesh that changes under a slider teaches the process.

Fifteen minutes on the projector

Name the stores: atmosphere, biosphere, ocean, rock, fossil. Then the arrows: photosynthesis, respiration, dissolution, weathering. A store is a reservoir. A flux is a transfer. Do not serve an arrow salad. Open the Fossil-fuel tap. The atmosphere store grows. The slow store falls. Fossil fuels are a slow geologic store we tap into the fast cycle. Burning fuel does not create new carbon atoms. It moves them from a slow store to the air. That is the misconception. Stay on the physical transfer. Weathering is a slow transfer toward rock and ocean stores, not a daily flux. The ocean exchanges carbon with the atmosphere both ways. Finish in Check.

Open the lab full screen (F). Labels on (L). Speak the first step before you touch a slider: Name the stores: atmosphere, biosphere, ocean, rock, fossil. Then the arrows. Then the second: Photosynthesis, respiration, dissolution, weathering. Fast thin arrows; slow rock arrows. Then the third: Open the Fossil-fuel tap. Atmosphere store grows. Slow store falls. The tap moves carbon; it does not invent atoms.

The sliders that earn their keep are Fossil-fuel tap. Space plays; arrows nudge time; R resets. Parameters the URL can remember: fossil. If you only have eight minutes, skip the last step and finish in Check. Projector layout (P) is for the back row: one idea, large type, the model still live.

Name stores first, out loud: atmosphere, biosphere, ocean, rock, fossil. Then chase one fast arrow and one slow arrow. Open the Fossil-fuel tap and watch the air box grow as the slow box falls. Hide labels (L) and ask which box is the tap’s source. Scrub the slider back to low so the class sees the reverse. Keyboard: L labels, R reset. The slider lives in the bar. Particles on the thick arrow are the anthropogenic flux, not a new element. Finish in Check.

The in-site film is “What is Climate Change? Crash Course Geography #14” (Crash Course Geography, about 11 min, Crash Course / Complexly on YouTube. Standard YouTube licence. Educational embed, autoplay off.). Autoplay is off. Play one minute if you need a second voice; do not let the film eat the slot. The 3D still has to move under your hand.

What the third row will get wrong

You will hear the misconception before you have finished the first sentence. Write the false claim on the board and leave it there until the model has contradicted it. Do not skip this. A fluent pupil can recite the hook and still believe the false sentence.

“Burning fuel creates new carbon atoms.” — no. It moves them from a slow store to the air.

“The ocean store does not talk to the air.” — no. It exchanges carbon with the atmosphere both ways.

“Weathering is a fast daily flux like respiration.” — no. Weathering is slow. Fast and slow are different arrows on the same diagram.

Pitfalls to keep in your pocket: One arrow salad with no named stores. Teaching burning as creating new carbon atoms. Inventing petagram numbers the boxes do not give. Do not let a pupil leave thinking the 3D is a photograph. It is a teaching model. Where vertical exaggeration exists, T collapses it and the caption says so. A labelled lie of scale is honest. An unlabelled one is a cartoon.

Two places, not a slogan

Carbon sits in stores: atmosphere, biosphere, ocean, sediment and rock, fossil fuel. A flux is a transfer between stores. Fast cycle: photosynthesis pulls carbon into the biosphere; respiration and decay send it back; the ocean exchanges with the air both ways. Slow cycle: weathering, burial, rock. Fossil fuel is a slow geologic store. The Fossil-fuel tap in this lab is a human flux from that slow box into the atmosphere — a thick arrow, not a new element. Open the tap: the atmosphere sphere grows; the fossil box shrinks. Burning does not create carbon atoms; it moves them. Weathering is not a daily flux. Do not serve an arrow salad with no named stores. Box sizes here are teaching volumes, not IPCC petagrams — do not invent a number and write it as fact. The water cycle lab is mass conserved in H2O; this lab is mass conserved in C. Pair them. Land-use change is another flux on the same diagram, still a transfer, still not a sermon. Stay on the boxes and the arrows. The thick orange arrow is the tap. Fast arrows stay thin.

The first place to land is UK energy / stores. The second is Land-use carbon. Same process, different rock or climate. If a pupil can only name one place, they have a postcard, not a mechanism. Atlas entries for those names are a click from the case list; send them back to the lab with one sentence they can say in Check.

Do not flatten the comparison into “this country versus that country.” Name the landform. Holderness is till, not chalk. Hawaii is a hotspot, not an island arc. Yosemite is a glacial trough, not a river canyon. The 3D is allowed to be schematic; the place names are not allowed to be sloppy.

Figures and the film

Field photograph: A living carbon store. A living carbon store. This is the classroom sense of carbon-cycle: a named landform, process, or object. Source: Wikimedia Commons / NASA / USGS / NOAA, public domain or CC. Credit: Wikimedia Commons / NASA / USGS / NOAA, public domain or CC.

Mechanism photograph: Field or official figure for teaching Carbon cycle. A second photograph for the projector script — not the lab cover. Credit: Wikimedia Commons / NASA / USGS.

Two photographs, two jobs. The field picture is the place. The mechanism picture is the process. Do not run the lesson on a single Apollo Earth disc. A carbon-cycle class is a forest and a seam, not a blue marble. An ENSO class is a Pacific temperature map, not Africa from Apollo 17.

Words they must be able to say

Say these out loud once while you click the matching mesh. If a word has no mesh, it still has a photograph in Terms.

Store: A place carbon sits: atmosphere, biosphere, ocean, rock, fossil. Exam language also accepts “Reservoir”. Flux: A transfer between stores. Photosynthesis: Fast flux from atmosphere into the biosphere. Respiration: Fast flux from biosphere back to the atmosphere. Weathering: Slow transfer toward rock and ocean stores. Not a daily flux. Fossil fuel: A slow geologic store of carbon. The tap moves it into the fast cycle. Fast cycle: Atmosphere–biosphere–ocean exchanges on human timescales. Slow cycle: Rock, burial, weathering. Geologic time unless we tap it.

Exam-language toggle (the Teacher tab) swaps UK/US pairs where they exist — levée/levee, arête/arete — so a mixed room is not punished for spelling.

Close the slot

Without the 3D view: five stores — atmosphere, biosphere, ocean, rock, fossil. Fluxes between them. Fast: photosynthesis and respiration. Slow: weathering and burial. The fossil tap moves carbon from a slow geologic store into the air; it does not invent atoms. The ocean exchanges with the atmosphere both ways. Box sizes are teaching, not a litre census. Stay on the physical machine. Land-use change is another flux on the same diagram, still a transfer, still not a sermon. The tap is a transfer.

Finish in Check — ten questions, not a mood. The bank mixes definition, process, the misconception you just killed, a named place, and a read-the-model item (click the part; T). If a pupil can only recite the hook, they have not used the geometry. Wrong answers still show the one-line explain. Do not skip the explain.

Sources on the Teacher tab are the trail, not a bibliography to copy. NOAA carbon; IPCC FAQ as school context — no invented stats.

Link back to the live lab and keep the same slug. Do not invent a parallel worksheet that contradicts T, SI, or the named parts.

This note is worldwide. Curriculum tags (GCSE; A-level carbon; APES 1.4 / 4.6) are filters, not a flag. A class in Nairobi, London, or Shanghai can use the same 3D. Ages (GCSE, A-level, NGSS MS, APES) are a suggested band. If a sentence only works in one exam board, rewrite it before you project it.

Write these three lines on the board before you dim the lights. One: Fast stores and slow stores. The fossil-fuel tap is a human transfer from slow to fast. Two: the misconception “Burning fuel creates new carbon atoms.”. Three: the named parts they must click. Then drive the model. Check is ten questions covering definition, process, the misconception, a place, and a read-the-model item. Do not skip the explain on a wrong answer.

Board, units, and what not to say

SI first. Metres, kilometres, degrees Celsius, metres per second. A conversion in brackets is courtesy, not a second system. Do not let a pupil leave thinking the 3D is a photograph. It is a teaching model. Where vertical exaggeration exists, T collapses it and the caption says so.

Do not say “teaching mesh”, “sprinkle”, or “thin free surface not a fat pipe” out loud. Say the landform. Seasons are ~23.44° of axial tilt, not Earth–Sun distance. The outer core is liquid; S-waves do not pass. Yosemite is a glacial U-trough. San Andreas is a transform. Hawaiʻi and Yellowstone are hotspots. Florida is not a glacial trough.

If the room is noisy, projector layout (P) is the back-row setting: one idea, large type, the model still live. Full screen (F). Labels (L). Space plays. Arrows nudge time. R resets. The URL can remember fossil. Send them home with the same link; there is no login.

In-site film

What is Climate Change? Crash Course Geography #14. Crash Course Geography. Crash Course / Complexly on YouTube. Standard YouTube licence. Educational embed, autoplay off. Autoplay off.