Based on the "Teacher Key" (the colored answer sheet) shown in the bottom right of the image, here are the correct answers to fill in the blanks on the student worksheet.
1. The Diagram Steps (Top Section)
The numbers 1–4 on the diagram correspond to these descriptions:
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1: Solar energy from the sun passes through the atmosphere.
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2: Some of the energy is reflected back out to space.
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3: Earth's surface is heated by the solar energy, then radiates the heat back out towards space.
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4: Greenhouse gases in the atmosphere trap some of the heat, keeping it near Earth's surface.
2. Greenhouse Gases (Middle Section)
Here is the information for the specific gas boxes:
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Carbon dioxide
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Formula: $CO_{2(g)}$
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Sources: cars, factories, cellular respiration
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Methane
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Formula: $CH_{4(g)}$
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Sources: agriculture (cows), coal mining, landfills
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Water vapour
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Formula: $H_2O_{(g)}$
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Sources: evaporation, respiration, irrigation
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Nitrous oxide
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Formula: $N_2O_{(g)}$
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Sources: agriculture, combustion of FF (fossil fuels)
3. Natural vs. Artificial Effects (Bottom Section)
These sentences explain the difference between the natural greenhouse effect and the artificial one caused by humans:
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Natural: Good + keeps the Earth warm. Without it, the average atmospheric temperature would be below 0°C.
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Artificial: Caused by human activity. Adding more gases into the atmosphere, which then trap more heat. Too much extra heat being trapped = Earth's temperatures rising.
Parent Tip: Review the logic above to help your child master the concept of greenhouse effect worksheet.
