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Why does the rate of temperature increase inside Earth not remain uniform from surface to depth?

Answer and explanation

Correct answer: Because heat sources conductivity and pressure vary

The geothermal gradient means the rate at which temperature rises as depth increases. This rate is not identical everywhere or at every depth. It is influenced by the distribution of internal heat, the type and conductivity of rocks, pressure, physical state, and local geological conditions. Near the surface, measured increases may differ from those deeper inside, so a simple straight-line assumption is unsuitable for the whole Earth.

Option A is the best answer because it recognises that heat sources, conductivity, and pressure vary with depth and location. The other choices are scientifically false: Earth is not completely cold inside, sunlight cannot reach the centre, and ocean water cannot cool the deep interior. Thus, the temperature increase is real but its rate is not uniform throughout Earth.

Related tags

Geothermal-GradientTemperatureEarth-Interior

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