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What is the general effect on melting point when pressure increases inside Earth?

Answer and explanation

Correct answer: Melting point may generally increase

The direct answer is C: melting point may generally increase when pressure increases. Pressure pushes particles closer and can favour the solid state, so more heat may be needed to melt a material. The careful word is “generally” or “may,” because the exact effect depends on the substance and its phase relation; the school-level Earth-science conclusion is that high pressure can raise the melting point. A is wrong because pressure does not make every melting point zero. B is wrong because pressure does have a relationship with melting behaviour. D is wrong because rainfall is an atmospheric process and does not control the melting point of deep minerals. C is therefore the best option and helps explain why the inner core can remain solid despite very high temperature. Memory cue: high pressure favours solidity, but remember exceptions exist.

Related tags

PressureMelting-PointInner-Core

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