Why is the Earth's surface warmer than would be expected just from the amount of energy it receives from the Sun?

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BlackTom AI · Accepted Answer

The question asks why Earth’s surface tends to be warmer than we would expect from the Sun’s energy alone. This invites evaluating several possible sources of extra heating or misleading factors.
Option 1: 'Internal pressure on the mantle' — This is not a surface warming mechanism in the sense of adding global, sustained heat at the surface. Mantle processes influence tectonics and can drive volcanic activity but the steady, planet-wide surface warming beyond solar input is not explained by mantle pressure alone.
Option 2: 'Volcanoes' — Volcanic activity releases heat and gases, but on a global, long-term average, volcanism does not account for the persistent warmth of Earth’s entire surface. It is episodic and localized; while it contributes to atmospheric composition, it does not consistently raise global surface temperatures beyond solar input in a steady way.
Option 3: 'The greenhouse effect' — This is the core mechanism that traps a portion of the Sun’s energy in the lower atmosphere and surface through greenhouse gases like water vapor, carbon dioxide, and methane. These gases absorb infrared radiation and re-radiate heat back toward the surface, creating a warmer average surface temperature than would be expected from solar input alone. This explanation aligns with established climate physics and the observed atmospheric composition.
Option 4: 'Heating from the molten core' — The Earth's core is extremely hot, but the heat transfer from the interior to the surface is very slow and amounts to only a tiny fraction of the surface energy balance. It does not meaningfully raise the average surface temperature compared with solar heating. Therefore this is not a primary driver of the observed surface warmth.
Option 5: 'Heating by radioactivity within the Earth' — Natural radioactive decay in the planet’s interior does generate heat, but similar to molten core heating, the contribution to surface temperature is negligible in the global energy balance on human-relevant timescales. It cannot account for the observed warmth of the surface as a whole.
In summary, among the given options, the greenhouse effect is the scientifically accepted explanation for why Earth’s surface is warmer than would be expected from sunlight alone, while the other choices describe sources that are either too weak, too localized, or not consistent with the steady global warming pattern.

ASTRON 2140 AU2025 (23428) Quiz 2 - 2025 Oct 10

Why is the Earth's surface warmer than would be expected just from the amount of energy it receives from the Sun?

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