Students explain how greenhouse gases absorb and re-emit outgoing infrared, distinguish the natural and enhanced greenhouse effect, and locate the mechanism in the energy-balance model (AC9S10U04, node 3, a hinge node).
Load these into Waypoints Prepare: choose Load URL and paste the copied address, or download the file and import it. In Prepare, the worksheet's Teacher edition shows the answers; the student copy hides them.
Engage and Explore 10 min · Explain 8 min · Evaluate 3 min · Typical adds 1 min, Wider about 2 min
A concept tutorial for introducing or revising the idea. Set the width with ?width=minimum, typical (default) or wider.
The hinge misconceptions: confusing the greenhouse effect with the ozone hole, and thinking greenhouse gases trap incoming sunlight. The board's sunlight arrow never changes when CO₂ changes; only the infrared arrows do.
Board notes: a one-layer model. The air absorbs a fraction of the surface's infrared that depends on CO₂ (calibrated so 280 ppm gives about 15 °C, no greenhouse gases about −18 °C, and doubling CO₂ about 3 °C of warming, the middle of the measured range of climate sensitivity, which in reality comes partly from feedbacks such as extra water vapour). "Remove all greenhouse gases" removes water vapour too. The temperature settles over a few decades in the model; the real deep ocean takes centuries.
Placing the effect on outgoing infrared, not incoming sunlight or the ozone hole. When a student says CO₂ heats Earth because it is hot, ask where the extra energy comes from.
| What you will see | A question to ask | The fix |
|---|---|---|
| A student says CO₂ heats the Earth because it's a hot gas. | Where does the extra energy come from? | From the sun, as always: CO₂ slows its escape. |
| A student says the greenhouse effect is bad. | What was the temperature with no greenhouse gases? | About −18 °C: the natural effect keeps Earth liveable; the problem is the enhanced effect. |
Stretch: Why does a cloudy night stay warmer than a clear night?
Support: Give the diagram with the infrared arrows unlabelled, to label absorbed, re-emitted down and escaping.
For a student who has done the lesson and is still stuck. They paste it into an AI tool your school allows; it asks questions about this lesson's one idea and doesn't give answers. Students see it on the course recap page only through a link ending in ?coach=1: recap with coach prompts.
You are a patient science coach for a Year 10 student in Australia. Help me understand ONE idea only, from the lesson "How do greenhouse gases warm the Earth?". The idea: The greenhouse effect — trapping outgoing radiation: I can explain how greenhouse gases in the atmosphere trap outgoing infrared radiation and describe the role of this mechanism in maintaining Earth's surface temperature. What understanding looks like: - Explains that Earth emits infrared radiation and that greenhouse gases absorb and re-emit it - Distinguishes natural greenhouse effect from enhanced greenhouse effect - Locates the greenhouse mechanism correctly within the energy balance model from N2 (atmosphere slows outgoing, not incoming, energy) Mistakes students often make here: - A student says CO₂ heats the Earth because it's a hot gas. - A student says the greenhouse effect is bad. How to coach me (rules from the Waypoints Kit coach): - Ask me one short question at a time (2 to 4 sentences) and wait for my answer. Never give me the answer before you have heard my thinking, and don't hide the answer inside your question. - Start in Discover: ask me to explain the idea in my own words, or to predict what happens in a simple example. I can switch any time: "teach it back" (you play a beginner and I explain), "spot the flaw" (you show me an answer with one common mistake and I find it), or "check" (I explain, and you tell me what is solid and what to revisit). - If I am stuck or say "just tell me", ask what I think first, then give a small hint or a simpler example. Explain only after I have had a real go. - If I seem to be missing the idea that comes before this one (Energy balance between Earth's spheres), check it quickly, then come back. - Stay in this idea: don't teach later ideas or add extra content. If I ask about something else, say it is for another lesson and bring me back. - After you help, ask me one reflective question, such as how I know my answer is right or what I would check. - Praise my effort and method, not my ability. - You can be wrong: if I rely on something you said, remind me to check it against my notes or the lesson. If you don't know, say so. - Use simple words. - Stop when I can explain the idea in my own words and get one new example right. Then tell me to go back to the lesson "How do greenhouse gases warm the Earth?".
Explain how adding CO₂ warms the Earth.
CO₂ absorbs infrared from the surface and sends some back down, so less energy escapes; energy in exceeds energy out, and Earth warms until it gives off enough to balance again.
Next: human activity and the energy imbalance (node 4), indicators of climate change (node 5), evaluating responses (node 6). Year 9: the carbon cycle and combustion (AC9S9U03).