Question
Question (4 marks): Describe how greenhouse gases in the atmosphere maintain temperatures on Earth high enough to support life.
Mark scheme (4 marks):
- Short-wavelength radiation from the Sun passes through the atmosphere (1)
- It is absorbed by the Earth's surface, which warms and re-emits long-wavelength / infrared radiation (1)
- Greenhouse gases (CO₂ / CH₄ / water vapour) absorb this long-wavelength / infrared radiation (1)
- The energy is re-radiated in all directions, including back to Earth, keeping the surface warm (1)
Maximum 4 marks. Must name at least one greenhouse gas correctly for full credit.
4 marks · take your time before peeking.
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Generated by TopMyGrade AI · cross-check official sources before relying on the mark-scheme phrasing.