The Earth's average temperature is a result of the balance between incoming solar radiation and outgoing thermal radiation, influenced by factors such as albedo (reflectivity) and the greenhouse effect. While albedo affects how much solar radiation is absorbed, the stated average temperature of 15°C is the actual observed average temperature of the Earth's surface under current conditions, which include the effect of greenhouse gases in the atmosphere. Without the natural greenhouse effect, the average temperature would be much lower, around -18°C.
The average temperature of the Earth due to the albedo effect is
Asked in WBCS Main Paper 4 2023 · Topic: The Earth (Origin and Evolution of the Earth)
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