Students explain energy balance as incoming absorbed solar energy equalling outgoing infrared over time, describe energy flows between the spheres, and identify the ocean as a heat store (AC9S10U04, node 2, a hinge node).
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Engage and Explore 8 min · Explain 8 min · Ocean store 1 min · Evaluate 3 min · Wider adds about 2 min
A concept tutorial for introducing or revising the idea. Set the width with ?width=minimum, typical (default) or wider.
The hinge is balance as a dynamic equality (big flows in and out), which the greenhouse lesson then disturbs.
Board notes: a one-layer energy-balance model. Average sunlight 340 W/m², 30% reflected; the surface gives off infrared (σT⁴); the air absorbs part of it and sends half back down. The starting temperature is the model's balance (about 15 °C). A change in sunlight or reflection creates an imbalance; the temperature then moves over a few decades (the model's heat store stands for the upper ocean) until out equals in. Real feedbacks (water vapour, ice, clouds) are left out.
Seeing a steady temperature as energy in equal to energy out, not no energy moving. When a student says nothing moves at balance, ask what the in and out numbers are.
| What you will see | A question to ask | The fix |
|---|---|---|
| A student thinks balance means no energy is moving. | What are the in and out numbers? | About 240 W/m² each way: big flows, equal. |
Stretch: If sunlight rose 1%, roughly how much would the model's temperature change? Try it.
Support: Give the diagram with arrows to label: in, reflected, absorbed, infrared out.
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 "What keeps Earth's temperature steady?". The idea: Energy balance between Earth's spheres: I can describe how energy flows between the geosphere, biosphere, hydrosphere and atmosphere and explain what it means for Earth to be in energy balance. What understanding looks like: - Describes energy exchange between at least three of the four spheres - Explains energy balance as the condition where incoming and outgoing energy are equal over time - Identifies the ocean or atmosphere as a store and distributor of heat energy Mistakes students often make here: - A student thinks balance means no energy is moving. 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 (Solar radiation and Earth's energy input), 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 "What keeps Earth's temperature steady?".
What is energy balance, and what happens if more energy comes in than goes out?
Energy in equals energy out over time. If more comes in, Earth warms until it gives off enough extra infrared to balance again.
Next: the greenhouse effect (node 3). Later: human activity and the energy imbalance (nodes 4 to 6).