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What happens to the density of mantle material when temperature increases?

Answer and explanation

Correct answer: Density decreases

The correct answer is option A, density decreases. The governing concept is thermal expansion: when mantle material is heated, its particles move more vigorously and the material expands. If its mass remains essentially the same while its volume increases, density decreases according to density = mass ÷ volume. The warmer material therefore becomes relatively buoyant and tends to rise, while cooler, denser material tends to sink. Density does not always remain unchanged, it cannot become infinite merely because temperature rises, and a colour change is not a density explanation. This relationship is central to the simplified model of mantle convection.

Related tags

TemperatureDensityMantle ConvectionPost Drift Studies And Convectional Current TheoryDistribution Of Oceans And ContinentsGeographyClass 11 Mcq

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