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'''Mantle'''
The Earth's mantle extends to a depth of 2900km. It is largely composed of substances rich in [[iron]] and [[magnesium]]. The melting point of a substance depends on the pressure it is under. As there is intense and increasing pressure as one travels deeper into the mantle, the lower part of this region is solid while the upper mantle is [[Thermoplasticity|plastic]], or semi-melted.
'''Why is the inner core solid, the outer core liquid, and the mantle solid/plastic?'''
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